Modified import.php so that it is tolerant of blank lines at the start of the file and also between components (eg VEVENTS).    Strictly speaking these are not allowed according to RFC5545, but it does no harm to tolerate them.

git-svn-id: http://svn.code.sf.net/p/mrbs/code/mrbs/trunk@2818 25f7e783-145e-4f2d-a9f8-dd7182bfe9c7