Removing unused macros

Probably results of copy and paste.

Refs #000.
Replacing macro with static const value

Making the name more descriptive. Removing multiple definitions of the
same macro.
Formatting according to the code standards

Refs #000
Using libMesh:invalid_uint for the case when the variable is not coupled.

Refs #000
9999999 is not the max for double

Refs #000
Removing a magic number

Refs #000
Adding a .mailmap file to help organize the output of 'git shortlog'

Refs #000
Merge pull request #4173 from andrsd/magic-numbers

Magic numbers
Merge pull request #4192 from jwpeterson/mailmap

Adding a .mailmap file to help organize the output of 'git shortlog'
Squash some statiz analyzer warnings (#3829)
Squash some more static analyzer warnings (#3829)
Squash even more static analyzer warnings (#3829)
Code formatting (#3829)
Make sure that we remove the main object file too
closes #4186
Merge pull request #4187 from dschwen/staticanalyzer_3829

Squash static analyzer warnings.
Add DOFMap output object (#4155)
Update active kernels through nonlinear system (#4155)
Output DOF list per variable and subdomain (#4155)
Make join flexible, rename keys (#4155)
Total number of DOFs (#4155)