Install CMake from a PPA
Install CMake from a PPA

This should fix the certificate issue on Travis CI:

Connecting to cmake.org (cmake.org)|66.194.253.19|:443... connected.

ERROR: no certificate subject alternative name matches

	requested host name `cmake.org'.

To connect to cmake.org insecurely, use `--no-check-certificate'.

WopsS/sampgdk,Zeex/sampgdk,Zeex/sampgdk,WopsS/sampgdk,Zeex/sampgdk,WopsS/sampgdk