script gem_home fix

[ysolis]

in the gem_home.sh file we see one particular line in gem_home_push, in line 3:

mkdir -p "$1" && pushd "$1" >/dev/null || return 1

this will try to create the dir for the new $GEM_HOME if this not exists, and if exists, 'fails silently'. this is related to Issues #7 and #9.

I think that gem_home must not try to create the project dir for the $GEM_HOME if not exists, if this happens must fail. With this the script will be more clean and avoid the problems mentioned in the Issues mentioned above.

[postmodern]

Interesting point, I will consider this.

[postmodern]

pushd would still be necessary, since we use pushd to expand the new working directory and use $PWD to derive the absolute gem_dir path.