Fix/maya physx unit

[jerome-jacob]

Please merge #394 before

Export physx scene to .xml with correct unit.

[Fl4reBot]

Refer to this link for build results (access rights to CI server needed):
http://50.250.211.65:7070//job/openCOLLADA-pc-pull-request/191/
openCOLLADA Win build SUCCESSFUL

build log (private)
http://50.250.211.65:7070/job/openCOLLADA-pc-pull-request/191/console

[Fl4reBot]

Refer to this link for build results (access rights to CI server needed):
http://50.250.211.65:7070//job/openCOLLADA-ubuntu-pull-request/68/
Test PASSed.

[Fl4reBot]

Refer to this link for build results (access rights to CI server needed):
http://50.250.211.65:7070//job/Maya-2015_2016-mac-pull-request/185/
ColladaMaya Mac build SUCCESSFUL

binaries: look for folder: PULL_REQUEST#395/COLLADAMaya/mac/2016-02-13_05-02-09_#185
http://opencollada.fl4re.com

build log (private)
http://50.250.211.65:7070/job/Maya-2015_2016-mac-pull-request/185/console

[Fl4reBot]

Refer to this link for build results (access rights to CI server needed):
http://50.250.211.65:7070//job/openCOLLADA-mac-pull-request/190/
openCOLLADA Mac build SUCCESSFUL

build log (private)
http://50.250.211.65:7070/job/openCOLLADA-mac-pull-request/190/console

[Fl4reBot]

Refer to this link for build results (access rights to CI server needed):
http://50.250.211.65:7070//job/COLLADA-MAYA-PC-PULL-REQUEST/191/
ColladaMAYA PC build SUCCESSFUL

binaries: look for folder: PULL_REQUEST#395/COLLADAMaya/win/2016-02-13_05-08-55_#191

http://opencollada.fl4re.com

build log (private)
http://50.250.211.65:7070/job/COLLADA-MAYA-PC-PULL-REQUEST/191/console

[Fl4reBot]

Refer to this link for build results (access rights to CI server needed):
http://50.250.211.65:7070//job/COLLADA-MAX-PC-PULL-REQUEST/195/
ColladaMAX build SUCCESSFUL

binaries: look for folder: PULL_REQUEST#395/COLLADAMax/2016-02-13_05-03-09_#195

http://www.opencollada.org

build log (private)
http://50.250.211.65:7070/job/COLLADA-MAX-PC-PULL-REQUEST/195/console