Maintenance version.

Two reminders:

• you should depend on specs2-core and other specific specs2 jars instead of depending on the full specs2 jar (see details here)
• if you depend on the full specs2 jar or on specs2-matcher-extra then you need to add "bintray" at "http://dl.bintray.com/scalaz/releases" to your resolvers

Features

• added a beCloseTo(100.13 within 2.significantFigures) matcher (by @FrontierOtr) #303

Improvements

• check the difference of collections only at report time
• improve the speed of collection differences: added optimization in the n^2 loop of findBestMatch (by @mustajarvi) #300

Fixes

• fixed a typo in Context.scala (by Artem Pyanykh) #302
• fixed the passing of quoted arguments: sbt> test-only -- ex "this example" will only execute examples with description matching .*this description.*
• fixed a compilation issue with TaskMatchers

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