Add Installation Instruction

Installation instructions added to README for three different options:

• Local dev server;
• Heroku;
• Google App Engine.

PDF handling

Update README.md

Added v0.5

ePub handling

• Added basic ePub handling;
• Minor fixes in RLT support and browser detection.

Right-to-left language support (Hebrew, Arabic)

• Right-to-left language support (עברית and العربية);
• Improved language auto-detection;
• “Modern” browser detection, reject old browsers such as IE8;

Improved context handling — hyphenation, punctuation, cleanup

v0.2-beta

Merge branch 'develop'

Initial public release - client/server version

Includes Flask app and client-side Javascript.