[DOC,FEATURE] Allowing more HTML tags in dox, fix to language_entities.dox.
[DOC] Multiple small dox fixes.
[INTERNAL] Adding docs/html and docs2/html to .gitignore.
Merge pull request #42 from singerj/index_docu

Updates and fixes to dox documentation
[DOC] Fixed some doc issues with the index.
Merge branch 'origin/develop' into origin/master