Fix checking on what linux we run

- runProcess returns null only if exception occured
- runProcess("", "which", ["apt-get"], ...) returns empty string on
  Fedora 19
ProcessHelper.openURL no longer blocks on Linux

By adding a ampersand (`&`) as a final argument `xdg-open` will run in the background.
That way it won't block the code calling openURL (for example the HTML5 test command).
See issue openfl/hxtools#47
Fix temporary file on Linux
Safety when nproc is not present on Linux system
Let's try that again
Fallback for number of processors, when 'nproc' is not present for Linux machines
Escape exe for ProcessHelper.runProcess
Merge pull request #48 from itavero/openurl-linux

ProcessHelper.openURL no longer blocks on Linux
Merge pull request #46 from sergey-miryanov/master

Fix checking on what linux we run
Read Options.txt when compiling C++
Minor setup fix
BlackBerry 10 fix
Increase HTTP timeout for setup
Do not regenerate HTML5 font hash if already exists (to speed up build time)
Path fixes
Rename to lime-tools
Update Travis CI script
hxtools should be lime-tools
Update Travis CI script
Update CI script