The docs state that the default ldflags includes the ShortCommit but in
reality the code uses the longer Commit value instead. This behavior has
existed since the defaults were introduced ~3 years ago in commit
4af2cb0.
Fixes#1264
* feat: templateable hooks
* test: improved test
* docs: docs about templateable hooks
* test: improve test
* test: skip test that only fails on travis
* fix: use the filename of the binary in snapcraft
When builds.binary is a path, only use the filename as the name
of the snapcraft app and as the command, instead of the full path.
* docs: use a path in the binary name
This allows users to specify different sets of compiler, assembler,
and/or linker flags for different packages. It also makes it possible to
specify generic flags that contain spaces. It does this while
maintaining compatibility with the old format of the fields in question
by up-converting bare strings into single-element lists.
Resolves#668
