Turn off NITF by default

Don't build NITF support by default. If NITF support is requested, error
if we can't find Nitro.
Merge pull request #582 from gadomski/nitf-default-off

Turn off NITF by default
Implement laz-perf compression #562

SQLite driver is done, but others to follow
un-break master due to #562 compression stuff
default my config to use the new BUILD_PLUGIN syntax
_TESTS of corresponding _PLUGIN cmake_dependent_option should default to ON
pgpointcloud test cleanup
More cast fun.
Two types of data.
Add non-const data()
install cmake 2.8.12 from PPA
include pgpointcloud bin directory
default to reasonable plugin locations if PDAL_DRIVER_PATH not set
auto directory_iterator works on OSX not linux
Merge pull request #585 from PDAL/issues/583-pgpointcloud-include

closes #583
Merge pull request #584 from PDAL/cmake-2.8.12-on-travis

install cmake 2.8.12 from PPA
Port FauxReader

* introduce PDAL_ADD_DRIVER macro that creates object library for the
  given driver
* 'drivers.faux.reader' becomes 'readers.faux'
* 'pdal::drivers::faux::Reader' becomes 'pdal::FauxReader'
* headers moved from ./include/pdal/drivers/faux to ./drivers/faux
* source moved from ./src/drivers/faux to ./drivers/faux
Install during travis's script

This tests the install process, which has regressed at times without
test failures.
Change case in FindOracle.cmake

Before this change, "REQUIRED" was not respected.
Default BUILD_WITH_OCI=OFF if no ORACLE_HOME