Simple docset updating, and docset metadata.
Split docset list retrieval and extraction into two callbacks.
Use structure to store loaded docset information.
Redownload docsets that are missing metadata.
Custom docset feeds. Fixed button states.
Metadata for all docsets.
The focus will be change on pressing enter in treeview or lineedit fixes #71
Merge remote-tracking branch 'upstream/master' into docsetUpdates
Show update progress in docsetsList.
Progress when downloading metadata for installed docsets
Select preferred download url from feed's source.
Merge pull request #135 from ZiDoMs/iss71

Change focus on pressing enter
Fix the tray icon problem in Unity

New requirements: libgtk2.0-dev libappindicator-dev
First try on network proxy configuration
Using the proxy on main window.
Proxy settings not being saved.
Merge pull request #136 from MichaelBeeu/docsetUpdates

Docset updates and docset feeds
Added an icon
Merge branch 'network_proxy' of https://github.com/ammachado/zeal into ammachado-network_proxy

Conflicts:
	zeal/zealsettingsdialog.cpp
	zeal/zealsettingsdialog.h
Merge branch 'ammachado-network_proxy'