[2.1] Add information on future feature for qgis server
small fix
Merge pull request #134 from yjacolin/qgisserver_newfeature

[2.1] Add information on new feature for qgis server (comment)
[2.0] Add a note on WMS-C + change description of tile set slider
updates from ManualTask list
Merge branch 'master' of github.com:qgis/QGIS-Documentation
added info about allow adding of sql queries with SelectAtId=false for PostgreSQL. Has also to be added to ORACLE
Removed double substitution from conf.py creating many errormsgs during build
inserted information about select by expression which replaces the query builder
Merge branch 'master' of github.com:qgis/QGIS-Documentation
created new chapter select by expression and removed old chapter query builder
removed unexpected identation errors
removed wrong references to website from index
removed warning from build Title underline too short
Merge pull request #135 from astroidex/master

added info about allow adding of sql queries with SelectAtId=false for P...
Merge pull request #136 from yjacolin/workingVector-newLabel

[2.0] Add a note on WMS-C + change description of tile set slider