update doc URL
doc AWSCredentialsHolder
add the ability to call .describe() to get information about the specified workflow execution including its type and some statistics
release 1.6.7.5
replace toString() with as boolean to address github issue #33
add test around the s3FileUpload bean and the RRS property
run integration tests in travis
Revert "replace toString() with as boolean to address github issue #33"

This reverts commit 77daf256f5ec581cd706419d5b3e39cdf25fe99e.
Revert "Revert "replace toString() with as boolean to address github issue #33""

This reverts commit 44ae2f79df4cfdef01d9236c95095aca09e63bc5.
add grails 2.3.5 as a grails version to run tests against
update AWSCredentialsHolder to check if properties is a String
doc AWSCredentialsHolder
Merge branch 'master' into gh-pages