[emacs] changed cache directory from ".cache" to "cache"
[emacs] change windmove keybinding meta key from shift to C-c
[emacs] add on the fly syntax check with flymake-mode and adjusted the compilation-exit-message-function
[emacs] added on the fly spell syntax check with flyspell-mode
[emacs] added cache directory to gitignore file
[emacs] removed all cperl specific settings. Will be enabled later on demand.