Removes make/local from repo

#### Summary:

This is for developers. Removes make/local from the code repository.

#### Intended Effect:

Makes it easier for developers to not accidentally check in their make/local file.

#### How to Verify:

Merge. 
1) Try running `make help` without a make/local. This should work; it doesn't work under the current development branch.
2) Add a make/local file. git should ignore this file without having to mess with the git index.

#### Side Effects:

None.

#### Documentation:

None. This is a fix for developers.

The current v2.5.0 package includes a make/local file with comments to guide users. In the next version, this file won't be there, unless we do what we do with the built pdf files: include it for the release, remove it as the next commit to the repo.

#### Reviewer Suggestions: 

Bob. This work for you?