add ->modified_files, deprecate ->check

[leejo]

Squashed commit of the following:

commit a210794ca2b27848fb03857be131b4a24b771899
Author: Lee Johnson lee@givengain.ch
Date: Tue Mar 8 09:28:24 2016 +0100

add ->modified_files, deprecate ->check

in Mojo::Server::Morbo - allows retrieval of entire list of files
changed (or undef) preventing morbo getting into a restart loop if
many files have changed. ->check is now redundant so deprecated

update tests in t/mojo/morbo.t tp reflect above changes

commit 3345a9d
Author: Andrew Nugged nugged@gmail.com
Date: Mon Mar 7 23:00:19 2016 +0200

Handle multiple changed files at once for restart

If you change numerous files at once or one-by-one in second(s),
Morbo saw first file changed and tried to restart right away
(though meanwhile restart process started, it can catch few files
more on next "sleep 1"), but then after restart Morbo finds next one
or next few changed files, not updated in cache, and restarts again
until all cached files iterated.

That causes Morbo to restart many times if you, for example, do checkout
for git branch where many files different or upload/sync pack of files
through sftp at once, etc.

Changes in code: now changed files names packed in array in one pass,
not returning after first met, and only returning that array. That
updates cache for all files, then calls restart.

Also notification message printed to console with one file name if only
one changed, that is for our usual work mode (when we uploaded one file
from editor), or give number of changed files only if we do mass change
(branch checkout, mass sync).