Generate an APC prefix based on __FILE__

Closes #654
updated VENDORS for 2.5.1
removed Travis configuration
Merge branch '2.3' into 2.4

* 2.3:
  removed Travis configuration
Merge branch '2.4' into 2.5

* 2.4:
  removed Travis configuration

Conflicts:
	.travis.yml
Merge branch '2.5'

* 2.5:
  removed Travis configuration
  updated VENDORS for 2.5.1
feature #657 Generate an APC prefix based on __FILE__ (trsteel88)

This PR was merged into the 2.6-dev branch.

Discussion
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Generate an APC prefix based on __FILE__

Closes #654

Commits
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3be1eee Generate an APC prefix based on __FILE__
added back a comment that aas removed in the previous merge
make config_dev.yml a valid YML file

`%..%` must be wrapped by quotes, or YML file is not valid!
bug #687 make config_dev.yml a valid YML file (jdespatis)

This PR was submitted for the master branch but it was merged into the 2.5 branch instead (closes #687).

Discussion
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make config_dev.yml a valid YML file

`%..%` must be wrapped by quotes, or YML file is not valid!

Commits
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848b095 make config_dev.yml a valid YML file
Merge branch '2.5'

* 2.5:
  make config_dev.yml a valid YML file
updated VENDORS for 2.5.3
Fixed version in links
minor #703 Fixed version in links (zomberg)

This PR was merged into the 2.5 branch.

Discussion
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Fixed version in links

Commits
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00c780a Fixed version in links
Merge branch '2.5'

* 2.5:
  Fixed version in links
  updated VENDORS for 2.5.3
updated version in README for 2.6