Improve "arc land" error message to mention SVN alternatives

Summary: Fixes T3813. This error message isn't very helpful in SVN; be more helpful.

Test Plan: Ran `arc land` in a Subversion repository, got a reasonable error message.

Reviewers: btrahan, asherkin

Reviewed By: asherkin

Subscribers: aran

Maniphest Tasks: T3813

Differential Revision: https://secure.phabricator.com/D7275
Fix `arc browse path:line`

Summary: Ref T5781. This was broken in some earlier changes in T5781.

Test Plan: Ran `arc browse README`, `arc browse README:10`.

Reviewers: chad, btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T5781

Differential Revision: https://secure.phabricator.com/D10346
Allow lines to be specified as comma delimited number ranges for arc browse

Summary: Ref T5971. We lose validation of the line ranges, but I don't think that's a huge issue.

Test Plan: Ran `arc browse README`, `arc browse README:3`, and `arc browse README:3,6-7`

Reviewers: btrahan, epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin

Maniphest Tasks: T5971

Differential Revision: https://secure.phabricator.com/D10352
Adjust py.test invocation per T5973

Summary: Fixes T5973

Test Plan: how does computer

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T5973

Differential Revision: https://secure.phabricator.com/D10356
Don't run "flake8" via stdin

Summary: flake8 v2.2.3 (released Aug 25) broke this. Just drop the stdin stuff.

Test Plan: User confirmed in IRC that this resolves the issue.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Differential Revision: https://secure.phabricator.com/D10358
Adding php -l linter

Summary: Adds a linter that checks php files for syntax errors using php -l

Test Plan:
Add a section to your .arclint file similar to:
```
"php": {
  "type": "php",
  "include": "(\\.php$)"
}
```

Then run arc lint on a php file with a syntax error.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, jacobwalker0814, Korvin

Differential Revision: https://secure.phabricator.com/D10370
fix typo in exception handling

Test Plan: brake .arcrc, see reasonable error.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: epriestley

Differential Revision: https://secure.phabricator.com/D10379
Merge remote-tracking branch 'upstream/master'