Added formal branch policy.
Clarified PR vs. issue + expected branch deletion.
Add optionalDependencies badge to README.md

Fixed by alanshaw/david-www#123
Merge pull request #176 from sun/policy-branch

Formalize the public feature/topic branch policy
Merge pull request #193 from markcarver/optional_dependencies

Add optionalDependencies badge to README.md
Fixed inline.image plugin operates on countless of .file DOM elements of patchReviewer.
Merge pull request #194 from sun/patchreview-inlineimage-clash

inline.image plugin operates on countless of .file DOM elements of patchReviewer
Fixed predicted new comment number is hard to recognize visually.
Merge pull request #195 from sun/comment-number-recognition

Predicted new comment number is hard to recognize visually
Removed unused prettify_line variable.
Classify old diff lines containing a comment as '.old.comment'.
Minor diff style cleanups (no visual changes).
Merge pull request #196 from sun/patchreview-cleanups

Minor patchreviewer cleanups