Merge pull request #10 from wagnert/0.5.8-beta

Set version 0.5.8-beta in build.default.properties file
Merge pull request #11 from wagnert/0.5.8-beta

Change composer.json dependencies to ~0.5.8@beta
Merge remote-tracking branch 'techdivision/0.5.8-beta' into 0.5.8-beta