WHAT:
1. STORJ Balance renamed to Available Balance
2. Balance history dropdown added
WHY:
better User experience
Change-Id: I4e7186fd285f6d9d1dd4b1ad93142fcf9d3367f3
WHAT:
credit history page implemented.
can be visited by clicking specific button in a free credits dropdown.
WHY:
UI didn't display remaining coupon value.
coupons and referral items (in future) are displayed in the same place.
Change-Id: I495fd7a99f2ea5117152aaf8f495bd5322f02588