Working on tags system #49
Working on #90.

It has been generalised so it will work for any text in OSB and any file
in github and bitbucket repos.

Just some extra testing needed...

TODO: Allow short description for search results when repos files are
retrieved
Centralized parsing function for getting md and txt files from repos
(parse_repo_links) and osb parsing, such as osbDoc, pubmed...
(parse_osb_links)
First iteration for #78: parsing pubmed
  TODO: 
  - [] Popup with some info 
  - [] Enhance bibliography styles
  - [] Link to other projects referencing this pub
Added nokogiri bundle for parsing html,css,xml...
Added new function explanation to wiki help #78
Working on export function #96
fixes #49
remove function related #90 old approach
working on #102
fixes #102
fixes #100
working on #105 (osbdoc rearrangement)
Merge branch 'release7' of github.com:OpenSourceBrain/redmine into release7