added travis ci build status to README.md
adding travis ci settings
adding phpunit 3.7.* to composer
removed phpunit 3.5 hard check
replacing assertType() with assertInstanceOf()
adding composer files to ignore list
skip memcached tests when extension is not enabled
Merge branch 'travis-ci' of github.com:aporat/zf1 into travis-ci

Conflicts:
	tests/Zend/Cache/LibmemcachedBackendTest.php
	tests/Zend/Cache/MemcachedBackendTest.php