readme: added information on how to generate the escape character

Make sure that users understand that on  different kayboard layouts you will have different ways of generating the escape character
Fix table formatting
Merge pull request #206 from vsekhar/patch-1

appc/spec: fix table formatting
readme: small changes to make the escape character generation look better

Changed it to proper code spans
Merge pull request #192 from virtualswede/master

readme: added information on how to generate the escape character
appc: remove remaining smartquotes in spec
cas: use tmpdir for tests
Merge pull request #207 from jonboulle/cas_test_tmp

cas: use tmpdir for tests
Merge pull request #211 from jonboulle/fix_quotes

appc: remove remaining smartquotes in spec
appc/spec: minor tweak to mountpoints
Merge pull request #205 from jonboulle/spec_mounts

appc/spec: minor tweak to mountpoints
appc/actool: remove unnecessary execute bits actool build output

Group and other execute bits are inappropriate for the produced .aci and
embedded app manifest files
Merge pull request #213 from vcaputo/urwgor

appc/actool: remove execute bits from build-created aci file mode
stage1: gitignore stage1/cache
Documentation: Add 'gpg' to build pre-requisites

Commit 00294ed ("stage1: gpg verify and cache retrieved coreos image")
added a dependency to 'gpg'. Add that to list of build pre-requisites.

Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>
stage1: add / to stage1/cache gitignore entry
Merge pull request #220 from penberg/docs/build-gpg

Documentation: Add 'gpg' to build pre-requisites
Merge pull request #216 from jzelinskie/ignore-cache

stage1: gitignore stage1/cache
Documentation: Adding version to hello world example

The actool is failing when validating the manifest.json, as version is missing.
stage1: generate a socket unit for socket-activated ports

 * Generate a systemd socket unit for socket-activated ports
 * Add socket-related path generators and cleanup rest
 * Remove unnecessary systemd unit path mkdirs, just trust the
   stage1 rootfs provides them.