Fix null
Fix lp-norm for integer vectors
added dct functions and interface for FFTW r2r transforms
plan_dct(A, region, flags, tlim) should work for scalar A too
fix merge conflict with dct test
tweak: remove extraneous semicolons
Merge branch 'master' of git://github.com/JuliaLang/julia into fftw_r2r
avoid creation of temp arrays in dct routines
Merge pull request #1878 from stevengj/fftw_r2r

add dct functions and interface to FFTW's r2r transforms