SSH2: add ssh-agent support
CS: Each file MUST end with exactly one newline character
Merge pull request #266 from bantu/cs-endfile-newline

CS: Each file MUST end with exactly one newline character

* bantu/cs-endfile-newline:
  CS: Each file MUST end with exactly one newline character
Add Travis CI PHP 5.6 environment.
Merge pull request #268 from bantu/travis/php-5.6

Add Travis CI PHP 5.6 environment.

* bantu/travis/php-5.6:
  Add Travis CI PHP 5.6 environment.
Add build directory.
Use exclude instead of changing severity.
Update PHP_CodeSniffer from 1.4.7 to 1.5.2. This fixes a rule inheritance bug.
Apply coding guidelines (with exceptions) to the tests directory.
Merge pull request #269 from bantu/code-sniffer-tests

Apply Code Sniffer to tests folder

* bantu/code-sniffer-tests:
  Apply coding guidelines (with exceptions) to the tests directory.
  Update PHP_CodeSniffer from 1.4.7 to 1.5.2. This fixes a rule inheritance bug.
  Use exclude instead of changing severity.
  Add build directory.
SSH_Agent: misc updates
SSH_Agent: phpdoc updates
Merge pull request #265 from terrafrost/ssh-agent

SSH2: add ssh-agent support

* terrafrost/ssh-agent:
  SSH_Agent: phpdoc updates
  SSH_Agent: misc updates
  SSH2: add ssh-agent support
Add newline at EOF to phpseclib/System/SSH_Agent.php.
SSH_Agent: a few changes per bantu