Remove buildspec, update README for simplified installation instructions (#217)

Author: tobywf

NOTICE

@@ -1,2 +1,2 @@
-AWS CloudFormation RPDK Java Plugin
+CloudFormation CLI Java Plugin
 Copyright 2018-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.

README.md

@@ -7,10 +7,9 @@ This plugin library helps to provide Java runtime bindings for the execution of
 Usage
 -----
 
-If you are using this package to build resource providers for CloudFormation, install the [CloudFormation CLI](https://github.com/aws-cloudformation/cloudformation-cli) and the [CloudFormation CLI Java Plugin](https://github.com/aws-cloudformation/cloudformation-cli-java-plugin)
+If you are using this package to build resource providers for CloudFormation, install the [CloudFormation CLI Java Plugin](https://github.com/aws-cloudformation/cloudformation-cli-java-plugin) - this will automatically install the the [CloudFormation CLI](https://github.com/aws-cloudformation/cloudformation-cli)! A Python virtual environment is recommended.
 
 ```shell
-pip3 install cloudformation-cli
 pip3 install cloudformation-cli-java-plugin
 ```
 
@@ -19,23 +18,25 @@ Refer to the documentation for the [CloudFormation CLI](https://github.com/aws-c
 Development
 -----------
 
-First, you will need to install the [CloudFormation CLI](https://github.com/aws-cloudformation/cloudformation-cli), as it is a required dependency:
+For changes to the plugin, a Python virtual environment is recommended. Check out and install the plugin in editable mode:
 
 ```shell
-pip3 install cloudformation-cli
+python3 -m venv env
+source env/bin/activate
+pip3 install -e /path/to/cloudformation-cli-java-plugin
 ```
 
-For changes to the plugin, a Python virtual environment is recommended.
+You may also want to check out the [CloudFormation CLI](https://github.com/aws-cloudformation/cloudformation-cli) if you wish to make edits to that. In this case, installing them in one operation works well:
 
 ```shell
-python3 -m venv env
-source env/bin/activate
-# assuming cloudformation-cli has already been cloned/downloaded
-pip3 install -e .
-pre-commit install
+pip3 install \
+  -e /path/to/cloudformation-cli \
+  -e /path/to/cloudformation-cli-java-plugin
 ```
 
-Linting and running unit tests is done via [pre-commit](https://pre-commit.com/), and so is performed automatically on commit. The continuous integration also runs these checks. Manual options are available so you don't have to commit):
+That ensures neither is accidentally installed from PyPI.
+
+Linting and running unit tests is done via [pre-commit](https://pre-commit.com/), and so is performed automatically on commit after being installed (`pre-commit install`). The continuous integration also runs these checks. Manual options are available so you don't have to commit:
 
 ```shell
 # run all hooks on all files, mirrors what the CI runs

buildspec.yml

@@ -41,7 +41,7 @@ def find_version(*file_paths):
     entry_points={"rpdk.v1.languages": ["java = rpdk.java.codegen:JavaLanguagePlugin"]},
     license="Apache License 2.0",
     classifiers=[
-        "Development Status :: 4 - Beta",
+        "Development Status :: 5 - Production/Stable",
         "Environment :: Console",
         "Intended Audience :: Developers",
         "License :: OSI Approved :: Apache Software License",