Stabalized call selection
 - updated angular-material to version 0.6.1
Merge remote-tracking branch 'origin/stabalizeCallSelector'
Bug: Wrong ID is sent in response, when using exectueAPICallById -> Adapted apiSpecs.js to find this bug
* fixed id bug
* reverted url for execution of workflow from /execute to /executions
Merge branch 'executionsId'
started documentation of api.js
Added documentation for api.js
Merge branch 'serverDocumentation'
* added request execution on restCallOverview
* made requests editable on restCallOverview