Added Travis-CI build script
[Build] Test build OpenTK with mono 3.2.6 and 2.10.11

Squashed commit of the following:

commit 15ec03cd3f5f09ed88c51b62393fd6fa3476b03a
Author: thefiddler <stapostol@gmail.com>
Date:   Mon Feb 24 15:53:18 2014 +0100

    [Build] Fixed missing '' typo

commit 9e3dcad6124db52ec9035a8e6126244d9c856bfd
Author: thefiddler <stapostol@gmail.com>
Date:   Mon Feb 24 15:27:07 2014 +0100

    [Build] Install mono either from pwd or from mounted /Volume

commit b7303b68eaf3f4867e73a89fd22bd11caecf4f38
Author: thefiddler <stapostol@gmail.com>
Date:   Mon Feb 24 15:21:40 2014 +0100

    [Build] Do not stop build when wget fails

    The build stops iff no valid mono framework can be installed

commit 875c23294e6adc5061589576c6eabd43894ae9dd
Author: thefiddler <stapostol@gmail.com>
Date:   Mon Feb 24 15:13:08 2014 +0100

    [Build] Fix 3.2.x and 2.10.x mono download urls

commit 7bcbc789ce89cd16e06d5a62b05dd249432fcba0
Author: thefiddler <stapostol@gmail.com>
Date:   Mon Feb 24 11:58:57 2014 +0100

    [Build] Use .pkg file for mono installation on Travis

commit 60fef5aa7db9929c99ef22a778c87f634bcba266
Author: thefiddler <stapostol@gmail.com>
Date:   Mon Feb 24 11:43:12 2014 +0100

    [Build] Detect *.yml as text files

commit 7fb42856f187cb0503494523d2e524df8bda1cbc
Author: thefiddler <stapostol@gmail.com>
Date:   Mon Feb 24 11:40:07 2014 +0100

    [Build] Move first xbuild run to pre-build scripts

commit e1cfcf76202ba82d196cc6dceabb25c93c24ef87
Author: thefiddler <stapostol@gmail.com>
Date:   Mon Feb 24 11:38:19 2014 +0100

    [Build] Fixed mono 3.2.6 download url

commit c6941844353b53a7e8fb614565243ffbc31679d7
Author: thefiddler <stapostol@gmail.com>
Date:   Mon Feb 24 11:32:16 2014 +0100

    [Build] Run xbuild twice for GlobalAssemblyInfo.cs

    This works around an issue in xbuild, where pre-build events
    are not resolved correctly. The first run generates
    GlobalAssemblyInfo.cs; the second run actually builds the project
Squashed commit of the following:

commit db75670cb94a61b78e4e096f995fab6d5349978a
Author: thefiddler <stapostol@gmail.com>
Date:   Mon Feb 24 23:26:49 2014 +0100

    [Build] Build both debug and release configurations

commit 2a4a1dbc19d7ef2e12d3f4bb63b0e29b108e5050
Author: thefiddler <stapostol@gmail.com>
Date:   Mon Feb 24 23:20:51 2014 +0100

    [Build] Invoke xbuild once now that build order is fixed

commit 63b724d70e6b969dee11a740e5ac50e343cdcc48
Author: thefiddler <stapostol@gmail.com>
Date:   Mon Feb 24 23:19:23 2014 +0100

    [Build] Maintain support for VS2012

commit d9aed1173373625d583b462bd8e0cad373246412
Author: Stefanos A <stapostol@gmail.com>
Date:   Mon Feb 24 23:16:57 2014 +0100

    [Build] Attempt to fix xbuild build order
Add ErrorHelper to bindings.

Wrap new generated binding calls with using ErrorHelper. Sets up a try
to call the method in and a finally block to call Dispose on the
ErrorHelper. Currently hardcoded to only work for the graphics modules.
[Rewrite] Fixed exit from try-finally block
[Build] Fixed ErrorHelper local variable

We need to emit a ldloca instruction before constructing the
ErrorHelper instance, in order to reference it in the finally
block below.
[Build] Added -debug to Rewrite commandline parameters
Merge branch 'calli' into develop
[Input] Added KeyModifiers enumeration

KeyModifiers are represented as a bitwise combination of the Alt,
Control and Shift keys.
[Mac] Implemented modifier keys
[SDL2] Corrected win/alt key mapping (was swapped previously)
[SDL2] Added PeepEvents/PollEvent functions
[Input] Added modifier keys to KeyboardKeyEventArgs
[SDL2] Implemented modifier keys

Additionally, removed event watch callback in favor of calling
PollEvent() directly in ProcessEvents, which should be more efficient.
[Input] Implemented GetModifiers() method
[Win] Implemented modifier keys
[X11] Implemented modifier keys
[Examples] Display modifier key information
[X11] Fixed KeyUp event arguments

KeyUp event was incorrectly fired with KeyDownEventArgs instead of KeyUpEventArgs. This is now fixed.
Merge branch 'keymod' into develop