0.0.2-SNAPSHOT
change versioning scheme for development versions; s/-SNAPSHOT/git/

`jpi release` will add trailing `-SNAPSHOT` to the version name
if the argument `--release` is not given.
add pseudo semaphore to avoid multiple jobs at same time
fixed around $PATH handling

* do not shellescape the value for $PATH variable
* separate `PATH+PYENV` into two parts.
  Jenkins chooses apporopriate path separater for the platform.

invoke rehash before invoking pip to ensure if there is binstub.
`mkdir -p` doesn't exit with non-zero even if the directory exists
mark @launcher as transient
keep lock until the last rehash
v0.0.2
Merge branch 'release-0.0.2'