Add Nexus 6 option

Testing Nexus 6 build

Signed-off-by: binkybear <binkybear@nethunter.com>
switch nethunterbuild.sh to master branch
updated nethunterbuild.sh

changed inconsistencies and fixed some bugs
Add the support for Nexus 7 with CyanogenMod.
Few spelling errors in previous commit.
The grep failure in nightly version check.
Merge pull request #118 from Gh0u1L5/development

Add support for Nexus 7 with CyanogenMod Kernel