Remove trailing spaces
Add SBT installation instructions link
Fix receiver typo
Fix deprecation issues.

The 'val' in the for comprehension is unneeded and deprecated, so I removed it.
'Integer' is deprecated - I've switched to the Scala specific Int, which can
never be null
Merge pull request #5 from bobtfish/master

Fix deprecation warnings..
Merge pull request #3 from vti/master

Small README improvements
Merge pull request #4 from vti/typo

Fix receiver typo
Merge remote-tracking branch 'upstream/master'