Update index.md

adding -k option to curl to ignore cert warning (cert identifies itself as www.github.com when called as raw.github.com - but we need to call as raw to get the raw output).
Include mention of upgrading on the homepage

Closes #34
Merge pull request #33 from jeckman/master

Update index.md
The suggested path should be '/usr/local/bin/' and not '/usr/bin/' as '/usr/local/' is for user installed items like this.
Merge pull request #35 from JackSzwergold/suggested-path-fix

The suggested path should be '/usr/local/bin/' and not '/usr/bin/' as '/...
Release post for v0.15.1
Add extra-php to example wp-cli.yml

See https://github.com/wp-cli/wp-cli/issues/1046#issuecomment-44189268
fix indentation
extra-php is only available for 'core config'
add dbuser and dbpass config values to config example
check certs and save with same name

curl should check for certs (hence no -k) and not follow redirects (no -L) to improve security a bit, and with -O it saves the a file with the remote name on the current directory, no redirect needed
Merge pull request #37 from santagada/master

check certs and save with same name
Merge branch 'master' into redesign-2014