Remove bashisms in bin/clone

pushd/popd are not supported in all /bin/sh implementations, use the
more standard `cd -` to return to initial position. The `cd -` may
actually be completely unnecessary though, as long as the script
is executed rather than sourced the final directory change has no effect.
Tests for empty array and object in section and each

One of these tests, 006-simple-section-011.json, does not pass with
the current lightncandy.  This is because {"foo": {}, "bar": []} has
the same output with json_decode($json, true) for both foo and bar.

To resolve the issue lightncandy would at some point in the future
need to handle popo's in the input data.
Add tests for {{else}} in section and each context

One test, 036-sectionelse-005.json, fails due to a pre-existing
issue handlebars having different handling for [] and {} in
section context.
Merge pull request #2 from ebernhardson/section-empty-object

Tests for empty array and object in section and each
Merge pull request #3 from ebernhardson/root-and-comments

Add tests for two more handlebars features
Merge pull request #1 from ebernhardson/remove-bashism

Remove bashisms in bin/clone
Merge pull request #4 from ebernhardson/each-else

Add tests for {{else}} in section and each context
cd .. is more readable
Auto test on zordius/lightncandy@a826b8a1ab11cde4cc6dbaf8d4399ae595bf3f20
up
Auto test on zordius/lightncandy@25dac11bb774370f93ccbf97f6aed0451ed8ec93
Auto test on zordius/lightncandy@d0d5f16708ea285f28e7d2f5961e902b0e039e0c
Auto test on zordius/lightncandy@97b92c6d432ac45e19e29b2067d70decd8933626
add a testcase in test 036
add 8 known issues ( 036-sectionelse-005 and 006-simple-section-011 )
Merge branch 'master' of github.com:zordius/HandlebarsTest
Auto test on zordius/lightncandy@e142b6e116f63a82b3510fdaaf38dc9e3e476b57
Auto test on zordius/lightncandy@c9b2d950b4c9e5187fefbce52a4ba3d55a9faf77
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