Fixes language switch for overview layouts

See scala/scala.github.com#129
Adds Coursera Statistics blog article
Merge branch 'news', adds Coursera statistics article
Merge pull request #136 from xeno-by/master

docs for macros
Merge pull request #134 from scalajp/topic/overview-fix

Fixes language switch for overview layouts
Removing rdiscount from config
Typo fixes to the progfun statistics article
Merge pull request #137 from xeno-by/master

corrects a typo in type macros guide 
Clarified wording in progfun-stats article
Merge branch 'master' of github.com:scala/scala.github.com
progfun-stats article fix, fixed title of graph, added legend to difficulty graphs
Merge pull request #138 from xeno-by/master

updated the macro guide
Merge pull request #139 from xeno-by/master

updates on using macros with maven and sbt 
Merge pull request #140 from xeno-by/master

changes to the signature of c.introduceTopLevel 
Merge pull request #141 from xeno-by/master

nightlies of paradise are now published to sonatype! 
Merge pull request #142 from xeno-by/master

moved lifter and h2db typemacro examples to separate repos 
Merge pull request #143 from xeno-by/master

paradise is now rebased against master 
Merge pull request #144 from xeno-by/master

links to nightly paradise docs 
Merge pull request #145 from xeno-by/master

description of an sbt problem with macro paradise 
Merge pull request #146 from xeno-by/master

stub of the reflection guide