Update httpclient and use `MultipartEntityBuilder`
Use RequestConfig.Builder and add timeout value
Add progress
Merge branch 'master' of github.com:x2on/gradle-hockeyapp-plugin into httpclient

Conflicts:
	src/main/groovy/de/felixschulze/gradle/HockeyAppUploadTask.groovy
Merge pull request #16 from x2on/httpclient

Update httpclient and use `MultipartEntityBuilder`