Fix package names to conform with packagist's naming policies

Summary:
This change will allow the package to be submitted to packagist.org
for easy installation via Composer.

Reviewers: vanmeeuwen, machniak

Reviewed By: machniak

Subscribers: bruederli

Differential Revision: https://git.kolab.org/D121

composer.json

 {
-	"name": "kolab/Net_LDAP3",
+	"name": "kolab/net_ldap3",
 	"description": "A successor of the PEAR:Net_LDAP2 module providing advanced functionality for accessing LDAP directories",
 	"type": "library",
 	"version": "1.0.4",
@@ -31,7 +31,7 @@
 	],
 	"require": {
 		"php": ">=5.3.3",
-		"pear-pear/Net_LDAP2": ">=2.0.12"
+		"pear-pear/net_ldap2": ">=2.0.12"
 	},
 	"autoload": {
 		"classmap": ["lib/"]