to do list changes

currency, validation, redirecting after sale
properties
Fixed activity_book_details clipping
Updated TODO list
Fixed email seller button
Started better button hiding solution
formatting changes

we can revert these if you want.  the lack of alignment was triggering
some ocd.
Merge remote-tracking branch 'origin/Development'

Conflicts:
	TODO.txt
	src/cs275/bookswap/BookViewAdapter.java
	src/cs275/bookswap/SellScreen.java