fix demo 3d mousepick test

add the missing camera parameter to the _input_event()
Merge pull request #980 from UsernameIsAReservedWord/fix-demo-3d-mousepick

fix demo 3d mousepick test
xml_parser: check array length index before accessing the array.
New Code Completion
-=-=-=-=-=-=-=-=-=-

-Massive improvement to code completion
-Argument hinting for functions

If you manage to out-smart the code-completion in a situation where completion
should be possible to guess, let me know.

 Please enter the commit message for your changes. Lines starting
Merge branch 'master' of https://github.com/okamstudio/godot
-fix compilation issue
-fix missing built-ins in completion
-fix parse error
-fixed crash reported by n-pigeon
-added brace matching to go with the new code completion
-removed annoying pragma
Merge pull request #984 from orbitcowboy/master

xml_parser: check array length index before accessing the array.
oops, C++11 makes me screw up
Merge branch 'master' of https://github.com/okamstudio/godot
Merge branch 'master' into develop