Initial version of pretty AST printing.
Moved prettifyAst method from Prettifier to SharedHelpers.
Enhanced SharedHelpers.prettifyAst to escape '(' and ')' contained in String.
Refactor AssertionsMacro to reduce code duplication.
Bumped rev to 2.0.1-SNAP5
Upgrade dependencies versions.
Merge branch 'pretty-ast' of https://github.com/cheeseng/scalatest
Dropped unused object in PrettifierSpec.
Merge branch 'macro-refactor' of https://github.com/cheeseng/scalatest
Merge branch 'asm-upgrade' of https://github.com/cheeseng/scalatest
Bumped Scala version to 2.10.3, because can't build in 2.10.0 anymore
on my podunk 8GIGABYTE computer. 2.10.3 has that bug fix that eliminates
the memory leak that hurt ScalaTest builds a lot, so that solved it.
Also reduced mem to 4G in ant file, and bumped the ScalaTest version
to 2.0.1-SNAP6.