Merge pull request #2 from Timalex/development

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Merge pull request #4 from Timalex/development

Refactored login code
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Update LoginActivity, add JSON team in to SharedPreferences
Merge pull request #3 from Danielhe280/master

Updated LoginActivity
WeekView

Can conveniently be created through XML, where a list of daynames should
also be supplied.
Still needs logic for displaying day number and month.
Refactored DayButton

Removed code only necessary for XML-creation of standalone DayButton. It
is not necessary when using creating WeekView with XML.
WeekView usable