remove old 'autocomplete' anchor; messes with Kramdown

fixes wp-cli/wp-cli#644
add missing trailing slashes
add release post for 0.11.1
WP_CLI_PHP_ARGS not WP_CLI_PHP_INI

fixes wp-cli/wp-cli#651
stop trying to install Boris automatically

It frequently fails because it depends on several PHP extensions,
scaring off new users.

Related: wp-cli/wp-cli#640
installer: export PATH
installer: s/.bashrc/.bash_profile/ to match the home page instructions

see wp-cli/wp-cli#676
Corrects minor misspelling on install message.
Adding alternate location based on older versions of MAMP

General installer always failed for me. Working now.
add 0.11.2 release post
explicitly include the '_s' folder. fixes wp-cli/wp-cli#610
explicitly update to the stable version
detect if Composer failed to include any required packages

This script displayed success message, even if Composer comand failed (e.g. "Installation failed, reverting ./composer.json to its original content. 
PFXPHP-CLI files have been successfully installed. 
To test PFXPHP-CLI ...")
This update prints success/failure message depending on Composer output.
detect if Composer returned unsuccessful exit code

update according to [scribu's suggestion](https://github.com/wp-cli/wp-cli.github.com/pull/23#issuecomment-24018000)
detect if Composer returned unsuccessful exit code

missed removing extra echo in last commit
fix indentation; remove hocum 'fi'

see #23