[maven-release-plugin] prepare release spritepacker-maven-plugin-1.0.0
add .gitkeep for empty "sprites" directory integration test
Revert "[maven-release-plugin] prepare release spritepacker-maven-plugin-1.0.0"

This reverts commit 99c2f69ccc48c0cacd1fdd69843a54ac4dfdb4be.
[maven-release-plugin] prepare release spritepacker-maven-plugin-1.0.0
[maven-release-plugin] prepare for next development iteration
Make sure that output contains platform-appropriate end-of-line characters
Updated to take into account if output strings already contain CRLF EOLs
fixed do-nothing line of code ;)
[maven-release-plugin] rollback the release of spritepacker-maven-plugin-1.0.0
Split the output string into lines lazily instead of replacing all line endings all at once.
Re-introduce the guava dependency, since it is already a transitive dependency and quite convenient.
Add clarifying comment to the line splitting.
Add file name to failure message to help identifying errors.
Omit empty lines in text output.
Rename variable to avoid confusion.
Merge pull request #2 from 1and1/master

Consistently generate output using the system specific line separator.