v.0.056 Fixes #19 and introduces regionMatrix(). Tests with lineprof (see http://www.hansenlab.org/rstats/2014/01/30/lineprof/ and http://adv-r.had.co.nz/memory.html) revealed that coverageToExon() could be improved for memory use, and maybe speed. regionMatrix() has an alternative implementation with derfinder code that is faster and less memory intensive: basically uses getRegionCoverage() instead of coverageToExon(). It will be implemented on the next version. New arguments were introduced to filterData() and loadCoverage() related to regionMatrix(). getRegionCoverage() was changed slightly related to #20