Support unified diffs

Features:

• Added support unified diffs

Allow to select code without line numbers

Improvements:

• Allow to select code without line numbers

Contributor:

• @lantian

Bug fixes and tests

Fixes:

• Fixes several bugs related to configurations

Tests:

• Coverage of 90%+ achieved, now the parser is much safer and the ui is also stable.

Goals:

• Keep coverage above 90%

Note: I still have no clue on how to do tests without having white space comparison for the htmls

Fix build on webpack

Fixes:

• Fix build on webpack by adding hogan.js dependency

Use hogan.js as templating engine

Change:

• Use hogan.js as a templating engine instead of nunjucks

Fix diff matching for big chunks

Fixes

• Fix diff matching for big chunks

Fix /dev/null paths

Fixes:

• Avoid displaying /dev/null paths for files

Fix filename parsing on filenames with tabs

2.0.0-beta7

Fix repeated variable name in same scope (thanks Codacy)

Fix parsing of special filenames

2.0.0-beta2

Prepare for release 2.0.0-beta2

Use nunjucks to generate HTML

Merge pull request #62 from rtfpessoa/clean-css

Clean files summary and diff headers and line numbers