Merge pull request #15 from balsamiq/master

Use -j 4 instead of unlimited processes on make
Add install script for opencv 2.4.8. Same as 2.4.6.1 besides 2.4.8 on sourceforge as a zip file.
Merge pull request #16 from cogwirrel/master

Add install script for opencv 2.4.8.
Merge branch 'jayrambhia/master'