feat(helm,tiller): add --reuse-name flag to helm install

feat(kube): reap related resources on delete

This will allow helm install to re-use names for releases that were
already deleted.

chore(README): link to Semver 2 spec

fix(tiller): remove partials and empty manifests

This removes partials and empty manifests during the sortHooks
operation. Doing so makes sortHooks the defacto place for sorting
manifests, hooks, and partials.

Closes #991

fix(cmd): set description for inspect

feat(*): add upgrade command and validations

Add subcommands to inspect only chart or values

fix(cmd): ensure tiller is running for connection

fix(tiller): merge -f values correctly

I edited releaseMock as part of this PR

Signed-off-by: Grantseltzer <grantseltzer@gmail.com>

Fixes: https://github.com/kubernetes/helm/issues/981

feat(helm): support command-line values for install

fix(tiller): improve deletion error messages

feat(ci): validate license block in source files

Add support for specifying key/value pairs on the command line, instead
of only in a YAML file.

This currently accepts either command line pairs or a YAML file, but
does not support combining the two.

Closes #944

feat(ci): run test coverage in parallel

This stops a repeat deletion from sending requests all the way to
Kubernetes, and gives a clear error message when a deletion is requested
on an already deleted resource.

Relates to #972

```
./scripts/coverage.sh  37.25s user 4.15s system 144% cpu 28.615 total
```
```
./scripts/coverage.sh  47.96s user 6.77s system 567% cpu 9.647 total
```

fix(tiller): provide filename when YAML is bad

feat(helm): add 'helm inspect'

This makes the template system less tolerant in the name of detecting
YAML parse errors before things are sent to Kubernetes. It returns a
more detailed error message when a template creates a manifest which is
not valid YAML.

Closes #957

This basic version of helm inspect displays the Chart.yaml and
values.yaml files on STDOUT.

Closes #967

This fixes a bug in which passed-in values files were not correctly
merged into the chart's default values YAML data. I believe it also
fixes some other prioritization bugs in values merging.

The existing unit test was wrong (see TestCoalesceValues). It is
fixed now. Also added more tests to simulate issue #971.

In the course of writing this, I removed some vestigial code as
mentioned in #920.

Closes #971
Closes #920

docs(README): update README with basic information

The README reflected an earlier stage of project development. This
update gives more useful "Why Helm?" documentation at the top, and
updates several of the instructions to be more reflective of current
status.