Update gems, etc. (#536)

* Make build work until we find out why sqlite3 1.4.0 is causing failure.
* Make build work for Travis matrix.
* Update some gems to avoid deprecations
* Use sassc-rails for asset pipeline

Author: lcreid

Gemfile

@@ -10,7 +10,7 @@ group :development do
   gem "chandler", ">= 0.7.0"
   gem "htmlbeautifier"
   gem "rubocop-rails", require: false
-  gem "sassc"
+  gem "sassc-rails"
   gem "webpacker", ">= 4.0.0.rc.3"
 end
 

test/gemfiles/6.0.gemfile

@@ -6,7 +6,7 @@ gem "rails", "~> 6.0.0.rc1"
 
 group :development do
   gem "rubocop-rails", require: false
-  gem "sass-rails"
+  gem "sassc"
   gem "webpacker", ">= 4.0.0.rc.3"
 end