Remove non-alphanumeric characters from project name when creating a Pig alias.
Merge pull request #102 from mortardata/cmiller_fix_dash_bug

[#50767809] Remove non-alphanumeric characters from project name when creating a Pig alias
[#50779653] Tell user that they need to cd after mortar project creation
Merge pull request #103 from mortardata/ddaniels_need_to_cd_after_project_create

[#50779653] Tell user that they need to cd after mortar project creation
[#50780115] Fix help strings for mortar:local commands