Added demowallet payment API

Multiple providers are supported. Check the configuration and add a similar payment.whatever.js to add a whatever payment service.

Jira-Issue: WP-651
Fixed minor bracket issue

Jira: WP-651
fixed weird bug on android

Jira-Issue: WP-651
Merge pull request #1 from andreasbotsikas/WP-651

Added Payment API for android
adds a mock payment implementation

for automated testing and demos on all platforms

Jira-issue: WP-1227
Merge pull request #2 from mlasak/WP-1227

adds a mock payment implementation (switching to / instead of . in service declaration)
fix jasmine browser tests

move tests to web_root/jasmine/ and fix refs to jasmine libs

Jira-issue: WP-1284
update tests to latest api changes

Jira-issue: WP-1284
remove old api impl

Jira-issue: WP-1284
Merge pull request #3 from aldafu/WP-1284-fix-jasmine-browser-tests

fix jasmine browser tests
Update README.md
Update README.md
Update README.md