Fix the file-filter... sheeesh...
Speed up blob-modification scan - assume most blobs already clean

We allocate memory to write the modified version of the blob iff we
encounter a 'dirty' line of text.

Also use 'view' to avoid holding the entire string representation of
the blob in memory at once.
Only execute BlobTextModifier if replacer's specified
Adding SBT configuration to push to oss.sonatype.org

http://www.scala-sbt.org/release/docs/Community/Using-Sonatype.html

I've also added these local conf files, not for inclusion in VCS:

~/.sbt/plugins/gpg.sbt
~/.sbt/sonatype.sbt