add objectGUID to be interpreted as binary attribute

at least Microsoft AD server sends it as binary, and without ";binary"
suffix in the name
Merge pull request #58 from huancz/master

add objectGUID to be interpreted as binary attribute
Added a note on how to install LDAP-dev package
Merge pull request #63 from jarradseers/patch-1

Added a note on how to install LDAP-dev package
Define LDAPConnection in local namespace