fix(tiller): fix spurious "no release found" errors.

fix(tiller): increase the max message size for grpc

test(*): fix Windows tests

Increase column width when listing releases

feat(helm): add 'helm fetch --prov' to fetch prov info

fix(helm): give different error if key is not private

fix(helm): add trimSuffix to helper functions

fix(helm): fix broken --values flag

Increases the default message size from 4MB to 10MB.

Previously, a "not found" error was returned if a key exists, but is not
a private key. Updated the error to better indicate the case.

fi(helm): add more tests for plugins

This fixes the 'helm upgrade --values', which I broke when fixing
'--set'.

Closes #1631

There are some places where releases are only located if they are in the
state DEPLOYED. That particular logic was incorrectly used for upgrades.
That caused #1566. While fixing that issue, I found that this was also
the root cause of #1587 (though because it was off by one). I added a
generic method to get the last release, regardless of its status.

This allows some behaviors that previously failed:

- 'helm upgrade' can now be performed on a DELETED release
- 'helm rollback' can now be performed on a DELETED release even if
  there is only one revision of that release history.

Closes #1566
Closes #1587

feat(tiller): update sprig to 2.7.0

This adds shasum, int, and float64 functions, and fixes quote escaping
for 'quote'.

Closes #1524

fix(helm): fix prompt error on Windows build

This backs out an earlier change that removed an int type assertion.

fix(hel): fix plugin format on tests

This adds tests for setupEnv, and also updates some documentation to
mirror the current state of plugins.

fix(helm): handle errors when plugin command is not found

fix(*): misc linter issues

fix(helm): add missing line ending on list output

Feature/repo url trailing slash

fix(ci): do not push canary image on release

chore(*): bump go1.7.3

fix(helm): write yaml without exec permission

feat(helm): Add Files.Glob method to permit file organization

Test plugins were in the original format. Updated to current format and
fixed the tests to stop silently ignoring the broken test.