Merge branch 'hotfix/1.5.2'
add travis to master
fix requirements in travis
Update Freeswitch repository download location
Update install/install-all.sh

added --no-check-certificate on all downloads from github
Merge pull request #30 from emartonline/patch-2

Update install/install-all.sh
merge
Merge branch 'develop'
merge
Merge branch 'develop'
Update README requirements mention