Changes to new welcome window and About window

[Elizabeth Brainerd]

Instead of "A tutorial on how to use XMALab can be found on our bitbucket wiki" "XMALab Tutorial"

Change to User Manual XMALab can be found on our bitbucket wiki XMALab User Manual

Change the link to our JEB paper to: http://jeb.biologists.org/content/219/23/3701

The old one links to the unformatted version.

And maybe make the About Window include all of the same information??

[Benjamin Knorlein]

fixes #142 : Added more info to AboutDialiog and changed WelcomeDialog text

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