Verifying From header before send mail

Signed-off-by: Michael Granados <michaelgranados@gmail.com>
Fix documentation instructions

Corrected the sphinx installation instructions to match the instructions in user_guide_src/README.rst
Signed-off-by:James L Parry <jim_parry@bcit.ca>
Better Issue report writeup

Documentation: contributing to CodeIgniter...
Added a reminder about issues vs support, and some tips for a good issue report.
This was suggested by a user on the forum, and seems like a good idea.
Signed-off-by:James L Parry <jim_parry@bcit.ca>
Merge pull request #3321 from jim-parry/jim-fix

Jim fix
Close #3322 [ci skip]
Making required changes

Signed-off-by: Michael Granados <michaelgranados@gmail.com>
Removing empty lines

Signed-off-by: Michael Granados <michaelgranados@gmail.com>
Merge pull request #3319 from dgmike/issue-3313

Verifying From header before send mail