[vim plugin] Don't use current dir as project dir unless it exists
[vim plugin] Don't use current dir as project dir unless it exists

Issue #72

neoclide/tern,inafact/tern,emallson/tern,Icenium/tern,kentdoppelganger/tern,dorellang/tern,talyian/tern,messfairy/tern,pombredanne/tern,othree/tern,fileability/tern,cdosborn/tern,aklt/tern,eranif/tern,albertinad/tern,albertinad/tern,cdosborn/tern,anandthakker/tern,fileability/tern,mcanthony/tern,dorellang/tern,rustemferreira/tern,cloud9ide/tern,mcanthony/tern,MarcelGerber/tern,vegansk/tern,eranif/tern,angelozerr/tern,anandthakker/tern,adrianton3/tern,cdosborn/tern,othree/tern,ryanstewart/tern,purcell/tern,neoclide/tern,marijnh/tern,sergeche/tern,messfairy/tern,albertinad/tern,adrianton3/tern,jgiles/tern,MarcelGerber/tern,othree/tern,neoclide/tern,emacsmirror/tern,sqs/tern,MarcelGerber/tern,ternjs/tern,jgiles/tern,jason0x43/tern,emallson/tern,marijnh/tern,anandthakker/tern,fileability/tern,adrianton3/tern,forivall/tern,marijnh/tern,ternjs/tern,mcanthony/tern,cloud9ide/tern,emacsmirror/tern,jgiles/tern,jeffslofish/tern,emallson/tern,magnars/tern,ypresto/tern,OliverJAsh/tern,Icenium/tern,talyian/tern,emacsmirror/tern,rustemferreira/tern,ternjs/tern,dorellang/tern,rustemferreira/tern,Icenium/tern,messfairy/tern,eranif/tern,angelozerr/tern,talyian/tern,kylehg/tern