Update export methods

.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+env/
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+*.egg-info/
+.installed.cfg
+*.egg
+.idea/
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*,cover
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+.settings

README.md

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+# ToSidewalk
+This program generates potential sidewalk network from OpenStreetMap network data.
+
+## Resources
+* OSM2Geojson: http://tyrasd.github.io/osmtogeojson/
+* LatLng visualization: http://www.darrinward.com/lat-long/?id=592078
+* Geojson visualization: http://geojson.io/
+* Geojson visualization: https://www.mapbox.com/editor/#data
+
+## Requirements
+This project uses the following python libraries as well as the C/C++ libraries that they depend on.
+* Basemap >= 1.0.7
+* Shapely >= 1.5.8
+* Rtree >= 0.8.2
+
+I think, especially on Windows, the easiest way to go is to use 
+Anaconda Python (https://store.continuum.io/cshop/anaconda/), a free Python distribution from Continuum.
+
+To install requirements, just use the `conda` command (e.g., `conda install basemap`). Note, however, at 
+the time of writing this README, GEOS (a C++ library for GIS stuff) cannot be installed on a Windows machine via
+`conda`. So instead, I install it through OSGeo4W bundle (http://trac.osgeo.org/osgeo4w/).
+
+Another hiccup I encountered with installing dependencies is installing Shapely and Rtree. For Shapely, I followed the instruction here to install it: http://gis.stackexchange.com/questions/38899/geos-and-shapely-installation-on-windows . Similarly, I installed Rtree using the whl in the following link: http://www.lfd.uci.edu/~gohlke/pythonlibs/#rtree
+
+Example:
+
+1. Uninstall Shapely (`pip uninstall shapely`)
+2. Download the Shapely wheel file from the following link: http://www.lfd.uci.edu/~gohlke/pythonlibs/#shapely
+3. Run `pip install wheel`
+4. Run `pip install THE_WHEEL_FILENAME`
+
+## Contributors
+* Zachary Lawrence (https://github.com/zacharylawrence)
+* Anthony Li (https://github.com/tongning)
+* Kotaro Hara