Merge pull request #56 from adamretter/master

[bugfix] Correct Javadoc for JDK 8
Merge pull request #58 from adamretter/master

Small documentation updates about artifacts
Merge pull request #59 from adamretter/master

Disable openjdk VMs as it is causing problems on Travis CI's Ubuntu
Merge pull request #60 from adamretter/master

Added some basic API examples
Remove scalaVersion from Scala compiler plugin, will be picked up from
library on classpath. Thanks @rwalpole for advice.
Update dependency and plugin versions
Switch to scalaz-stream for digest calculation