Fixed bug when saving node with id 0

if statement evaluated false for first node ever saved since it has ID 0
Added test for setting labels on node id 0 #114
Merge branch 'master' of https://github.com/mitom/neo4jphp into mitom-master
Do not lazy load when requesting relationship nodes if they are already set #113
Escape special characters in label names when setting/removing. Closes #112
PHAR is deprecated. Composer is the only supported way to install.
Update README.md

Remove PHAR references
Update README.md
Force empty query parameters to be encoded as objects. Closes #122
Can retrieve labels for node 0. Closes #110
URL encode relationship types to account for URL chars in type names.

Closes #132
Safely escape added/removed label names.

Closes #138
Merge pull request #141 from jadell/safe-escape-labels

Safely escape added/removed label names.