made EntryLogs and Summary tabbed fragments that MainActivity uses.
included the sign out functionality in MainActivity
added the created files to the pull request
added an additional comment in EntryLogsTab
merged with master
deleted EntryLogsActivty and SummaryActivity
fixed LogoActivity lauching into a fragment
RegisterActivity should go to MainActivity, not EntryLogsTab
fixed issues with tabs/activities with edit/delete entries
added author in SummaryTab
Merge pull request #115 from coldstar96/tabbed-app

Tabbed app
Merge branch 'master' into edit-delete-entries-in-entry-logs
Added a version of amount to dollars that returns string without the dollar sign. Fixed the bug in AddEntryActivity where the date recalled is one month in advance due to not adjusting to 0-based indexing