Update pinch_library.sh

Implement CSF Firewall
Update pinch_library.sh

Accidentally removed change default SSH port. Adjusted it for use with CSF now.
Update pinch_library.sh

Implement CSF Firewall
Update README.md
2.1 Release

* Changed linode library (and variables) to be intercompatible with
regular library
* Implemented CSF firewall
* Timezone is now set correct
* Now using ${var}
* Using array loop to delete users
* Ensures Postfix is deleted and installs Sendmail as a replacement
Merge branch 'csf-firewall' of https://github.com/VHWDev/Pinch into csf-firewall
Merge pull request #3 from VHWDev/csf-firewall

CSF Firewall and improvements