Renamed variables and commented code for readability

Renamed panes and variables so that the names were relevant (instead of panel_1, panel_2, etc.). The new variable names should help to make the code self-documenting. Comments were also added to help distinguish which areas of code corresponded with which panes.
Add functionality to the 'New Game' button in the toolbar panel.

The 'New Game' button on the top of the window now spawns a new tab that has the window for creating a new Planning poker session. Currenlty only one tab can be opened, and the tab cannot be closed.
Merge pull request #29 from sfmailand/sbl-dev

Add functionality to the 'New Game' button in the toolbar panel.

So this is great, but I feel like Austin's interface that he used in the Overview tab would make sense in the new game panel, and a Requirement's Manager like list of games would be in the Overview tab.  Then we could have a small bar on the right with the options to fill out for making a new game or something.
Merge branch 'sbl-dev' of https://github.com/ZPak/wpi-suite into zpak-sbl-dev
Merge branch 'sbl-dev' of git://github.com/struct-by-lightning/wpi-suite into sbl-dev