formatting
+ image-filters: make grammar more flexible to accomodate
  different ctors signitures
+ add 'hsla' filter placeholder (TODO: add impl)
+ remove inused <iostream> include
comment out non-critical failing karma conversion to_string tests, leaving just single important failure - refs #1741
Merge branch 'master' of github.com:mapnik/mapnik
+ use cxxflags option
+ update viewer.pro to use cxxflags
+ log rendering times
fix all double to_string conversion failures by using sprintf method in all cases - closes #1741