Change to skip installation if specified path already have specified version runtime.
 * add check of runtime version
 * add option parser and its definition
   * and -f option for force re-install

Squashed commit of the following:

commit 7307e3568d103489f8e7e1686addda1b62e147d2
Author: TAGOMORI Satoshi <tagomoris@gmail.com>
Date:   Mon Mar 10 20:39:02 2014 +0900

    tested now

commit 082d653d76f79093a2d2a1e19ac8bae7e0795a1d
Author: TAGOMORI Satoshi <tagomoris@gmail.com>
Date:   Mon Mar 10 20:24:53 2014 +0900

    For skips of pre-installed same version
     * document fixed
     * ./install script fixed for -f/-h option checks

commit ba59a8e680e818265569bdba8fb3a9c34cdfea7f
Author: TAGOMORI Satoshi <tagomoris@gmail.com>
Date:   Mon Mar 10 20:06:38 2014 +0900

    enabled for ignore check for same version

commit 04cb702968df80e08f65cf8e679c5e0ea4614627
Author: TAGOMORI Satoshi <tagomoris@gmail.com>
Date:   Mon Mar 10 20:05:46 2014 +0900

    do pre-installed version check for php, but forcely disabled now for lack of tests

commit d0fbab75280894c63d8cee260d78a0c818fbb362
Author: TAGOMORI Satoshi <tagomoris@gmail.com>
Date:   Mon Mar 10 20:05:25 2014 +0900

    do pre-installed version check for python

commit 77fe91ef3b17740c8ef7a9770758f3e0f977d244
Author: TAGOMORI Satoshi <tagomoris@gmail.com>
Date:   Mon Mar 10 20:03:54 2014 +0900

    debug sed formula

commit 7bbe8b4d39f02553b304c4d9c12c4352f3bb5024
Author: TAGOMORI Satoshi <tagomoris@gmail.com>
Date:   Mon Mar 10 19:46:33 2014 +0900

    do pre-installed version check for node

commit 49217f12a79df39838f750c733e74bd9863cbf03
Author: TAGOMORI Satoshi <tagomoris@gmail.com>
Date:   Mon Mar 10 19:45:52 2014 +0900

    add -f option to usage

commit 4c198ccc45b4e889f7ac404843d2665c500b9fb5
Author: TAGOMORI Satoshi <tagomoris@gmail.com>
Date:   Mon Mar 10 19:35:55 2014 +0900

    do pre-installed version check

commit 2c5b95af34e0cd0df8e504809780ccc13a8a2ec5
Author: TAGOMORI Satoshi <tagomoris@gmail.com>
Date:   Mon Mar 10 19:35:38 2014 +0900

    fix bug of escape, and add checks

commit b3135aff39e69ae29a25e3b57a33b22b5b267dec
Author: TAGOMORI Satoshi <tagomoris@gmail.com>
Date:   Mon Mar 10 19:04:25 2014 +0900

    testing impl to ignore already installed version, and add -f option for force re-install
fix quotings
update example runtime versions to latest stable