Added the SVG version of the new logo from John T. Haller
Added multi-resolution icon file for OSX.

Created on OSX 10.7.5. I don't have a HiDPI monitor to test with
so hopefully it's ok.
Typo fix
Fix cmake
Fix missing include, worked with qt5
Added link to Jens Miltners GitHub user page
Added link to our new Twitter account
Added link to website for Raquel Ravanini
Subclass QApplication and move most code from main() there

Create a new subclass of the QApplication class and move most of the
code in the main function to the constructor of the new class. This
makes the code a bit more consistent in terms of object orientedness,
makes it a little simpler and allows extending the new Application class
in the future.
Update version number in MacOS bundle configuration file
Implement file associations on MacOS by reacting on QFileOpenEvent

Remove the deactivated MacOS dependent code for reacting on Cocoa events
for file associations from main.cpp

Try to implement the same functionality by reacting on QFileOpenEvent in
the Application class.
Update cmake file
plot: keep the color between model updates
plot: swap Y and X column

also add a dummy column so the color isn't shown the rest of the row
plot: only select a color on double click

otherwise we will get some random globalcolor from qt
plot: rescale to all drawn axis

I did miss this call on the customplot widget
cmake: reindent file
updater: give us a chance to point to a different release page
updater: exit a possible redirect loop
updater: show the url we got from the release file