ENH: Added set/get methods for coordinate system in ImageMessage classes
BUG: LPS coordinate system value in ImageMessage does not match protocol

The COORDINATE_LPS enum value is 0 in the ImageMessage & ImageMessage2
classes, but the protocol says this should be 2. It is defined as 2 in
igtl_image.h (IGTL_IMAGE_COORD_LPS).

The enum has been changed so that the LPS value is 2.
Fix wrong use of delete operator
Fix wrong bitwise and operator
Fix compile warnings under clang
BUG: merge labonny's changes
Merge pull request #13 from perim/master

Fix wrong operators and compile warnings
ENH: add StringEchoServer example
STYLE: Fix wrong statement in help (coordinate -> string)
ENH: add PointListServer example
Merge pull request #18 from ihnorton/add_pointlistserver_example

ENH: add PointListServer example
ENH: Add TrajectoryMessage example.
ENH: Merge changes in master.