added explanation on ignoring drafts and duplicate titles to readme
added explanation on ignoring drafts and duplicate titles to readme

mremolt/refinerycms-wordpress-import,zyphlar/lfa-wordpress-import,ryanttb/refinerycms-wordpress-import,ryanttb/refinerycms-wordpress-import,mremolt/refinerycms-wordpress-import,zyphlar/lfa-wordpress-import,ryanttb/refinerycms-wordpress-import,ryanttb/refinerycms-wordpress-import