Changed MainView structure to resemble RequirementsManager

Made the structure more simlar to RequirementsManager's MainView class (used tabAdd method to add tab). The structure is also more like RequirementsManager's in the fact that the main panel extends JTabbedPane rather than the previous JPanel, then the content is contained in separate classes.
Merge branch 'sbl-dev' of git://github.com/struct-by-lightning/wpi-suite into sbl-dev
Disable 'Create Game' button when the game has been created.
Fixed imports in MainView.java
Merge pull request #52 from ZPak/sbl-dev

Changed MainView structure to resemble RequirementsManager
Merge pull request #55 from eVulmaNn/sbl-dev

Adds a label for the current deck to show
Tested by: Alec Thompson - ajthompson
Merge pull request #56 from sfmailand/sbl-dev

Disable 'Create Game' button when the game has been created.
Tested by: Alec Thompson - ajthompson