adding PyLTI to requirements.txt
Completed section (not tested):
 Deploy the LTI sample to a server

Outlined sections:
 Use the LTI sample in a course
 Create an LTI from the sample
Fixed a typo
Merge pull request #21 from pdpinch/master

adding PyLTI to requirements.txt.  I resolved this issue by changing requirements.txt: changed pylti==0.1.3 to pylti>=0.1.3
Added doc for adding LTI usage in edX Studio and got familiar with adding a problem to a new course.
Reworked VirtualEnvironment instructions
Standardized html reference structure.
Made section headings consistent.
Merge commit '6392ead24c60eda696a3066a6a46a51d0e695d63' into Feature/Tutorial
added link to Flask microframework website
Finished writing Section on running LTI sample in course locally.
Merge branch 'develop' into feature/Tutorial

* develop:
  added link to LTI documentation on edx-partner-course-staff.readthedocs.org
  modified command line code blocks to use Bash syntax and removed explicit command line prompt.
  apidocs PR ready for review
  apidocs PR ready for review
  add skeleton doc files, rework the Sphinx configuration, add docstrings to mit_lti_flask_sample.py
  Added support for Sphinx autodoc
removed contents.rst, moved its toc to index.rst.  Removed multiple additional files that we don't use.  Moved the license.rst file to the docs directory.
Corrected "fork"/"clone" instructions in Explore the LTI sample template section of tutorial.rst.
Corrected LTI Unit properties instructions to include Graded = True for Studio in tutorial.rst.
Added instructions to remove mongodb lock and restart mongodb in setup_edX_fullstack.rst.
Corrected config.py for running with fullstack on localhost.
Deleted two developer convenience scripts from "scripts" folder
Renamed "scripts" folder to "certs" because that is what it now contains.
Edited tutorial to use "certs" instead of "scripts"
Removed unused Introduction.rst file.
Corrected sphinx warning.
Made changes to make the terminology more consistent.
Added commands to clarify the heroku deployment of the sample app.
removed contents.rst, moved its toc to index.rst.  Removed multiple additional files that we don't use.  Moved the license.rst file to the docs directory.  reordered content of deploy_to_heroku.rst. Added comment to config.py
Merge pull request #23 from mitxlti/Feature/sphinx_build

Clean up Sphinx build: all comments addressed.
removed a number of empty .rst files, moved license.rst to docs folder, reordered content in deploy_to_heroku, changed web=2 to web=1 to respond to review comment.