Add missing Unit prefix to class Math_BigInteger_InternalTest.
Merge pull request #438 from bantu/BigInteger-InternalTest-ClassPrefix

Add missing Unit prefix to class Math_BigInteger_InternalTest.

* bantu/BigInteger-InternalTest-ClassPrefix:
  Add missing Unit prefix to class Math_BigInteger_InternalTest.
Add "Documentation" section to README. Add link to Sami.
Unit tests: changing the mode with runkit causes issues with static vars
Merge pull request #442 from bantu/readme-documentation-section

Add "Documentation" section to README. Add link to Sami.

* bantu/readme-documentation-section:
  Add "Documentation" section to README. Add link to Sami.
Travis CI: before_script should be install.
Travis CI: Overwrite before_install step. Default currently fails on PHP 5.2.
Merge pull request #445 from bantu/travis-ci-install

Travis CI: before_script should be install. Overwrite before_install for 5.2.

* bantu/travis-ci-install:
  Travis CI: Overwrite before_install step. Default currently fails on PHP 5.2.
  Travis CI: before_script should be install.
only use runkit functions if runkit isn't loaded
Merge pull request #443 from terrafrost/runkit-fix

Unit tests: changing the mode with runkit causes issues with static vars

* terrafrost/runkit-fix:
  only use runkit functions if runkit isn't loaded
  Unit tests: changing the mode with runkit causes issues with static vars