Update requirements.txt

Python library is now at 0.11.15
Merge pull request #305 from rserna2010/patch-1

Update requirements.txt
Add cascading navbar for current selected section
Stop tracking ignored files
Merge branch 'multi-rev' of github.com:balanced/balanced-docs into multi-rev
Merge pull request #306 from rserna2010/cascading_sidenav

Add cascading navbar for current selected section
Merge branch 'multi-rev' of github.com:balanced/balanced-docs into multi-rev
Sidebar style updates
Fix configs
Style updates
Forge base integration section