[fix] namespace missing
Merge upstream-2.3-current-2013-10-16 1/2
[travis] Add CI support for travis and gcov code coverage options.
[travis] Exclude rxp and testsuite from travis
[doc] Move README to markdown. Add travis and coveralls badges
[build] Add WARN and OPTIMISE options to configure
[testsuite] Allow const*DMatrix. Add a test for EST_DMatrix
[git] Ignore gcov files