Add configuration parsing to LDAP module
LDAP connect draft
Add ldap.c into Makefile
Incorporate LDAPURLDesc structure into ldap_config
Store whole URI for later use
Add control of response code for bind response
Draft of retry event for LDAP
Token expanding function
Fix default URI and configuration parsing
Wrap function for getting result code of LDAP results
Add lber.c into Makefile
Correct style of function prototype
Include lber.h into ldap module
Fix argument for new event
Make function ldap_init_fd available
Fix configuration parsing

Support for more attributes added plus some style correction.
Fix comparative function for ldap requests
Add pointer to LDAP msg into result structure

Result structure contains pointer to LDAP message that contains result
of LDAP search operation.
Create get_user_info

get_user_info is supposed to be called from IMAP module. It creates and
sends search request and stores it into pending_requests.
Improve freeing of bufferevents

Manually set each bufferevent to NULL value after it is freed -
otherwise we are no able check whether the bufferevent was free.