Accept user offsets in the *output* SRS
Ignore mloskot's _build subdirectory
Merge pull request #144 from pramsey/offsetsrep

Accept user offsets in the *output* SRS
Configure Travis CI for PDAL
Enable make -j N
Disable timestamp echo.

It seems that echo function aliases return code from cmake/make/ctest.
Install GDAL, PROJ.4 and libxml2 on Travis CI
Enable verbose apt-get
Try libgdal from ubuntugis/ppa
Call CMake with explicit dependencies
Add missing value in -DWITH_LIBXML2=ON
Install libgeotiff-dev
Fix invalid find_path() option PATH_PREFIXES
Return correct exit code on command failure
Replace return 1 with exit 1