[RELEASE] Released version 1.4.2

[RELEASE] Released version 1.4.2

Released version 1.4.2 with the following main changes :
    - [CLEANUP] product branch update
    - [DOC] Some more documentation cleanups
    - [BUG] clf logs segfault when capturing a non existant header
    - [OPTIM] config: only allocate check buffer when checks are enabled
    - [MEDIUM] checks: support multi-packet health check responses
    - [CLEANUP] session: remove duplicate test
    - [BUG] http: don't wait for response data to leave buffer is client has left
    - [MINOR] proto_uxst: set accept_date upon accept() to the wall clock time
    - [MINOR] stats: don't send empty lines in "show errors"
    - [MINOR] stats: make the data dump function reusable for other purposes
    - [MINOR] stats socket: add show sess <id> to dump details about a session
    - [BUG] stats: connection reset counters must be plain ascii, not HTML
    - [BUG] url_param hash may return a down server
    - [MINOR] force null-termination of hostname
    - [MEDIUM] connect to servers even when the input has already been closed
    - [BUG] don't merge anonymous ACLs !
    - [BUG] config: fix endless loop when parsing "on-error"
    - [MINOR] http: don't mark a server as failed when it returns 501/505
    - [OPTIM] checks: try to detect the end of response without polling again
    - [BUG] checks: don't report an error when recv() returns an error after data
    - [BUG] checks: don't abort when second poll returns an error
    - [MINOR] checks: make shutdown() silently fail
    - [BUG] http: fix truncated responses on chunk encoding when size divides buffer size
    - [BUG] init: unconditionally catch SIGPIPE
    - [BUG] checks: don't wait for a close to start parsing the response