refactoring
removed unnecessary checks in Config
refactored Autoloader; added support for json encoded format for environment "hosts" option
fixed a bug: if deploy strategy was set to "disable", release was still trying to do remote stuff. Now release step respects strategy.
fixed a bug: symlink config value was not respected
 - factored constants out;
 - fixed bug: "releases list" command would die checking for unnecessary --release parameter;
 - console prints log file name if if logging is enabled
Merge pull request #95 from voukka/master

Many bug fixes. With this fixes I was able to test my own Tasks! :)