Add Bundle-SCM to Constants

Signed-off-by: BJ Hargrave <bj@bjhargrave.com>
Use Constants values rather than hard coded strings

Bundle-Developer was incorrectly used.

Signed-off-by: BJ Hargrave <bj@bjhargrave.com>
bndlib: Bundle-SCM is set by cnf/build.bnd

Signed-off-by: BJ Hargrave <bj@bjhargrave.com>
jpm: Missing continuation character in Bundle-Developers

Signed-off-by: BJ Hargrave <bj@bjhargrave.com>
build: Tidy up bundle metadata

Signed-off-by: BJ Hargrave <bj@bjhargrave.com>
Merge pull request #689 from bjhargrave/pom-fixes

Pom fixes

Use Constants values rather than hard coded strings. Bundle-Developer was incorrectly used.