Version bump to 2.1.0.pre

Regenerated gemspec for version 2.0.3

Regenerated gemspec for version 2.0.2

Regenerated gemspec for version 2.0.1

Regenerated gemspec for version 2.0.0

Regenerated gemspec for version 1.8.6

Apparently Jeweler doesn't like pre-release gems

This reverts commit cff0fd2.

Regenerated gemspec for version

regenerate gemspec for 1.8.5

Regenerated gemspec for version 1.9.0