Revert "#5 Revert to 1.6 Stable"

This reverts commit 5c710920a571969a993dba481adb2395251e3e5c.
Changed logo to de Souza Institute's logo

Changed existing YOURLS logo to the de Souza Institute's logo
Making changes to YOURLS

We add custom changes to the YOURLS code base. These changes are
documented in detail in the Wiki Confluence page.
Minor changes to files

Deleted the config-sample.php, deleted install.php to prevent being
accessed fradulently.
Added 302-instead plugin

Added 302-instead plugin and also changed gitignore to now accept
plugins.
Disabled API and enabled hyphens

Commented entire yourls-api code and renamed it to prevent it from being
used, essentially disabling the API feature of YOURLS

Also enabled allow hyphens in short URLs
Code cleanup

Various spacing added so that deleted lines don't ruin formatting.
Merge pull request #7 from desouzainstitute/desouza-links-yourls

Merge changes into master