Test against multiple versions of Symfony console.

This ensures backwards compatibility.

Also use existing version of composer on Travis. There is really no need
to download and install our own.
Merge pull request #64 from kasperg/tests-fixtures-timeouts

Improve tests through local fixtures and timeout handling
Merge pull request #65 from kasperg/test-multiple-symfony-versions

Test against multiple versions of Symfony console.
Merge pull request #67 from kasperg/fix-enum-constants

Fix generation of Enum constants which resolve to PHP primitives
Add support for non-standard WSDL namespace aliases
Fixes #40
Added unit test of non standard WSDL namespaces based on Amazon EC2 WSDL.

Ignore generated files.
Fix code style