[devhelp] (36 commits) ...Merge branch 'improvements'

[Aleksander Morgado <aleksm src gnome org>]

Summary of changes:

  5d46e73... Added monitors to watch changes in the devhelp books
  11bb884... book-manager: Move book event monitoring to the book object
  be07b08... book: notify signal if updated or deleted
  0202031... book-manager: manage created books
  041ca59... gitignore: add some generated files to be ignored
  e8f9663... search: update completion when book list changes
  b984917... book-manager: different signals for book list and disabled 
  7262762... preferences: Update bookshelf list if book list changes
  370e25a... Do not fully rebuild trees and lists when books created, de
  bdedcde... Small indentation fixes
  c7fb4ca... book-tree: Proper order when new books created
  3094aa4... search: Proper order when books created
  2063eca... preferences: Proper order when books created
  bad9de1... book-manager: book updates treated as delete+create
  ff7688b... book: ensure a book reference in the timeout
  0bfec50... book-manager: add a timeout of 5s before trying to create t
  d0de8ea... book parser: Read and store book language
  e7b2545... preferences: New 'group by language' check in the UI
  ca78226... preferences: Connect new 'group by language' option with th
  4c5ab73... book-manager: Make 'group by language' a property
  07ed49c... preferences: Manage the list of books also in group by lang
  9c10567... book: Setup titlecasing of languages
  540a276... book-tree: Enabled showing books grouped by language
  4cf161d... book-tree: Always expand language groups initially
  87316b1... book-tree: Underline languange groups
  699c6d8... search: Sort first results prefixed with the search key (GN
  2d98c3a... book-manager: Keep language usage count
  14029c0... book-manager: notify languages enabled or disabled
  31ec356... search: add languages to combo box
  a8fcc34... search: Enable language-based search (GNOME bug 353108)
  fec4d24... search: added book and prefix completions, as well as other
  3f98c41... preferences ui: Book shelf tab first
  c24a4b5... preferences: refactor a little bit
  e977a75... language: new object in separate source files
  8bd31e9... book: doesn't need gtk+
  5b11219... Merge branch 'improvements'