Fixed issues with MainFrame.java

Closes #2, closes #3, closes #5, closes #6, closes #7, closes #9, closes #11, closes #13, closes #14;
fix issues on Account.java 

Closes #1, Closes #8
fix issues on AccountServerFactory.java 

Closes #16
fix issues on Checking.java 

Closes #18
fix issues on Checking.java 

Closes #23
Merge pull request #28 from jed833/XZ0U8_APRUITT1

xzou8 apruitt1