Change crew to abort just after errors

Update message

multiple packages even there are errors in the middle of compilation.  This solves such problems.

Add `zlibpkg` dep to Emacs.

Add buildessential as dependency if we're building from source

Add aarch64 support

Add aarch64 binary packages by duplicating existing armv7l packages.

Added bin heroku 4.28.3

Update php7 to 7.1.3

Fix a bug not removing CREW_DEST_DIR/* before the preconfiguration

Fix clisp

Use multicore for only compile-time

Change to perform `make` in sequential on packages not working in parallel

Revert to source build for powerline fonts

Update Go version to 1.8

[binutils] add gold-linker

Correct install directory

Update php7 from 7.1.0 to 7.1.2

As ChromeOS user land is 32bit, we can re-use the existing builds. Only the kernel is 64bit.

Updates go version to latest 1.8 release as of this time.

Tested working on Acer c720 w/ Chrome 55.0.2883.105, Platform 8872.76.0

Refactor/install.sh

Add new experimental package named glibc223 to support glibc-2.23

  - Include --readline configure option to enable interactive shell

Set GOROOT_BOOTSTRAP to existing go installation

Add license file for GPLv3

It fails to compile otherwise.

  - Change to not use wget's "-c" option for non tempral files
  - Change to remove /usr/local/bin/cc, /usr/local/bin/crew and
    /usr/local/lib/crew/.git prior to make them
  - Change to reuse /usr/local/lib/crew/lib if it exists

change to use tar instead of cp for better performance.
change to remove temporal files before extraction.