Check $_SERVER[argv] existency [Closes #145]

E.g. it is not set when test run from browser.
Environment: refactoring, setup() split to setupColors() and setupErrors()
tester.php: refactoring to class Tester
Runner: added TEST_FILE_EXTENSION
Runner: accept [ and ] in directory path
create-phar: standalone PHAR can be used as Tester and as testing bootstrap
Dumper::dumpException() ignores in stack trace class Assert
Released version 1.2.0
fixed in_array
Merge pull request #148 from dg/pull-refactoring

Refactoring of tester.php
FileMock: is readable & writable