Updated package version number
Updating changelog for release 0.7.4
Merge pull request #774 from christav/release-0.7.4

Version # bump and changelog update
Merge pull request #765 from WindowsAzure/release-0.7.4

Release 0.7.4
Merge pull request #775 from WindowsAzure/master

Merging release 0.7.4 from master to dev