Possibility to install last versions of OTP + disable SSL EC if needed

In the last version of OTP we don't have librairies appmon, toolbar, pman and tv any more. So a simple check for folder existance is added. (Bug fix #24 )
By if you want to use older version of OTP on CentOS 6.5 SSL EC must be disabled. I suggest to do it this way:
rake erl_cflags="-DOPENSSL_NO_EC=1" (Bug fix #26 )