rename blob/ to vendor/

in the future, we may start downloading files that aren't
blobs, such as mxm port configs (on mainboards that use
MXM graphics)

this directory will contain all of those files

generally change the language used, across lbmk, to make
use of "vendorfile" instead of "blob"

Signed-off-by: Leah Rowe <leah@libreboot.org>

.gitignore

@@ -22,7 +22,7 @@
 /push
 /version
 /versiondate
-/blob/
+/vendor/
 *me.bin
 *sch5545ec.bin
 /mrc/