changelog: only load graph data when showing changelog for both commit and commit loaded via ajax chunks.

changelog: fix and optimize loading of chunks for file history. - load-next/prev wasn't working - make sure pagination works as expected - speed up certain actions by pre-loading more attributes

style: optimized <code> element fonts.

security: limit the maximum password lenght to 72 characters to prevent possible server side resource consumption attack. - bcrypt heavy computation can lead to DOS using a very long password .eg 10**8 lenght. - we allowed this on registration or on password update

codemirror: added simple mode plugin required for certain code modes.

gists: add copy url to clipboard helper icon.

config: updated .ini files.

changelog: fix url generation for file changelog and ensure http redirect works as expected for unfound nodes.

js: organized and updated JS packages. - moved certain embeded files to be tracked via node2nix - bumped few libraries, jquery to 1.11.3 - bumped moustetrap to 1.6.1

white-list-access: improved UI.