Access transaction data (bug 1019573)

close #480
Bust spartacus asset caches (bug 1014564)

Close #489
Set SPARTACUS_STATIC in settings_test
Set default SPARTACUS_STATIC to localhost:7777
Add reverify url to spa view (bug 1023917)
Merge pull request #490 from muffinresearch/add-reverify-url

Add reverify url to spa view (bug 1023917)
Expire the spartacus build id in ten years (bug 1014564)

Set the spartacus build id to time.time() if it isn't set.
Close #492
Remove cache timeout in webpay.base.test_utils