Bump to version 0.3.0.

Clear the _tmp/gold directory before release too.

INSTALL.txt

@@ -12,8 +12,8 @@ Quick Start

If you haven't already done so, extract the tarball:
 
    tar -x --xz < oil-0.3.alpha1.tar.xz
    cd oil-0.3.alpha1
    tar -x --xz < oil-0.3.0.tar.xz
    cd oil-0.3.0

Either install as /usr/local/bin/osh:

@@ -31,7 +31,7 @@ The latter doesn't require root access, but it requires ~/bin to be in your
PATH.

NOTE: Out-of-tree builds are NOT currently supported, so you have to be in the
oil-0.3.alpha1 directory.
oil-0.3.0 directory.

Smoke Test
----------

doc/release-index.md

@@ -1,6 +1,6 @@
<!-- NOTE: This file is at /release/$VERSION/index.html -->

Oil Version 0.3.alpha1
Oil Version 0.3.0
-----------------

### What's New

oil-version.txt

@@ -1,4 +1,4 @@
0.3.alpha1
0.3.0

# The first line of this file is the Oil version, and the rest is ignored.
# It's used at build time for the release tarball, and at runtime for oil 

scripts/release.sh

@@ -83,7 +83,7 @@ log() {
remove-files() {
  rm -r -f \
    _devbuild _build _release \
    _tmp/{spec,wild,unit,osh2oil} \
    _tmp/{spec,wild,unit,gold,osh2oil} \
    _tmp/{osh-parser,osh-runtime,vm-baseline,oheap} \
    _tmp/metrics \
    _tmp/oil-tar-test