Install Ruby on Rails on Mac
  Please follow the below steps to i nstall RVM RUBY RAILS and Postgres in MAC yosemite.   Step 1.  Install Homebrew     Homebrew is a package manager for the Mac. Installing Homebrew by issuing the following command:     ruby -e  "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install) "     To make sure Homebrew is installed correctly run:   brew doctor     Step 2:  Install GPG Package.     Download and install the GPG package from the link   https://gpgtools.org     Step 3:  Install RVM     gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3     and     \curl -sSL https://get.rvm.io | bash -s stable     Reload your bash_profile, so it can initialize RVM.     ~/.bashrc     Run RVM requirements to install basic required packages with Homebrew. Accept the license agreement and install Xcode Tools. After installing the tools continue the rvm requirements installation.     rvm requirements     Step 4.  Install Requir...