Removed INSTALL file, since it mostly duplicates what's present in README.md

INSTALL

@@ -1,78 +0,0 @@
-Overview
-============
-
-fish is written in a sane subset of C++98, and uses a few components from C++TR1. It is known to build successfully with g++ 4.2 or later, and with clang 4.2. It also builds successfully as C++11.
-
-Prerequisites
-=============
-
-fish requires the following programs and libraries to build:
-
- - GNU make or Xcode tools
- - GCC or clang
- - curses or ncurses
- 
- It will also use if available:
- 
-  - Doxygen
-
-fish also relies on standard unix tools such as cat, cut, grep, sed,
-whoami, bc and echo.
-
-Simple install procedure
-========================
-
-Always begin by uninstalling any previous fish versions. This is done
-by running the command 'make uninstall' in the source directory of
-your previous fish installation.
-
-Autotools Build and Install
-========================
-
-    autoconf              # Create configure file
-    ./configure           # Generate Makefile
-    make [gmake on BSD]   # Compile fish
-    sudo make install     # Install fish
-
-configure supports the ---prefix option, for example:
-
-    ./configure --prefix=$HOME
-
-If fish reports that it could not find curses, try installing a curses development package and build again.
-
-On Debian or Ubuntu you want:
-
-	sudo apt-get install libncurses5-dev libncursesw5-dev
-
-on RedHat, CentOS, or Amazon EC2:
-
-    sudo yum install ncurses-devel
-
-Xcode Development Build
-========================
-
-Build the 'base' target in Xcode
-Run the fish executable, for example, in DerivedData/fish/Build/Products/Debug/base/bin/fish
-
-Xcode Build and Install
-========================
-
-    xcodebuild install
-    sudo ditto /tmp/fish.dst /
-
-Starting fish
-========================
-
-If you wish to use fish as your default shell, use the
-following command:
-
- % chsh -s /usr/local/bin/fish
-
-chsh will prompt you for your password, and change your default shell.
-
-To switch your default shell back, you can run:
-
- % chsh -s /bin/bash
-
-Substitute /bin/bash with /bin/tcsh or /bin/zsh as appropriate.
-