properly format empty nodes on their own lines
Update gem installation instructions

Won't install without the --pre due to the current state of the gem as 1.0.0.beta.1.
Correctly specify dependencies and versions.

Resolves #19
Merge pull request #17 from cknadler/patch-1

Update gem installation instructions

[ci skip]
Merge pull request #12 from shreeve/master

Properly format empty nodes on their own lines
Add test for haml tag on new line after XML tag with blank content
Bump version

[ci skip]
Suppress warning about VERSION redefine on 1.8.7