Originally observed that "successful" was misspelled "succesfull" on the build view page. While correcting that, a number of other spelling errors were also corrected.
Some tests compare the result to english strings.
Do not test UnixCommandExecutor on Windows.
PharTest: explain why PHAR writing test are skipped.
InstallCommandTest: mock checkRequirements to allow the tests to run.
Run php_parallel_lint before all other tests.
Close#846
