Rename "pathos" package to "path".

Rename "pathos" package to "path".

R=ajohnsen@google.com

Committed: https://code.google.com/p/dart/source/detail?r=24964

[Bob Nystrom, 2013-07-12 16:51:52]

I just did a straight rename of the package and fixed up the imports. I didn't
change any prefixes since those require changing the affected code and require
more care. But this should cover the user visible change.

[Anders Johnsen, 2013-07-12 17:23:57]

LGTM! very nice :)

https://codereview.chromium.org/18356011/diff/1/sdk/lib/_internal/dartdoc/lib...
File sdk/lib/_internal/dartdoc/lib/universe_serializer.dart (right):

https://codereview.chromium.org/18356011/diff/1/sdk/lib/_internal/dartdoc/lib...
sdk/lib/_internal/dartdoc/lib/universe_serializer.dart:13: // TODO(rnystrom):
Use "package:" URL (#4968).
Remove this todo too?

[Bob Nystrom, 2013-07-12 17:55:45]

Committed patchset #1 manually as r24964 (presubmit successful).

[Bob Nystrom, 2013-07-12 17:59:39]

https://codereview.chromium.org/18356011/diff/1/sdk/lib/_internal/dartdoc/lib...
File sdk/lib/_internal/dartdoc/lib/universe_serializer.dart (right):

https://codereview.chromium.org/18356011/diff/1/sdk/lib/_internal/dartdoc/lib...
sdk/lib/_internal/dartdoc/lib/universe_serializer.dart:13: // TODO(rnystrom):
Use "package:" URL (#4968).
On 2013/07/12 17:23:57, Anders Johnsen wrote:
> Remove this todo too?

I left it in because ideally those compiler imports would be package: too.
Though it's a moot point since dartdoc will hopefully be replaced by a new doc
tool soon anyway. :)