Remove $*_include_entities

Should always include entities, we need the info later
Error handling in case of missing config.php
Move functional code out of config.php
Fix handling of $*_count variables
Consolidate $screen_name, $sn, and $twit_name
Remove $*_contributor_details

I don't think Twitter even uses this feature? Either way
it's not used in this script. Can add it back later if needed.
Remove $*_trim_user, we rely on it being false

No reason to allow configuring trim_user when we need it to be false
config.php general cleanup

Clean up comments and formatting, change $*_exclude_replies to include
instead for consistency
Remove version tags from the beginning of files
Fix/add comments in index.php
Explain $screen_name better in config.php-dist
Get .DS_Store outta here, and add a .gitignore
Merge pull request #2 from craywolf/config_cleanup

Move functional code out of config.php