Fix OpenCloud adapter exists always return false

Should fix #160
Update OpenCloud.php

Changed exists check condition
Merge pull request #161 from lmammino/fix-opencloud-exists

Fix OpenCloud adapter exists always return false
Make pecl install verbose to check what is falling at travis when
install ssh2-beta ext. to check what is falling at travis when install
ssh2-beta ext.
Remove sudo from pecl command runned at travis.
Marked RackspaceCloudfiles as depreciated and change repo in
composer.json so it will not fail.
change vendor in composer
Ftp adapter # exists(): basename normalization must be done on both sides