Fix issue #150: use correct paths for dependencies.
Fix issue #150: use correct paths for dependencies.

https://nodejs.org/api/modules.html specifies what paths are
correct. One should never explicitly put "node_modules" in
dependency paths because npm is under no obligation to put things
where you told it to look for them. Issue #150 arises when
SimpleMDE is a dependency in some other project, so it and its
dependencies are peers under that project's "node_modules", and
there is no "./node_modules" within the SimpleMDE folder.

TL/DR: npm tells you where it puts dependencies, not vice versa.

sparksuite/simplemde-markdown-editor,vijos/vj-simplemde