bst-init: Ensure --element-path is respected by the command

Chandan Singhrequested to merge
chandan/fix-bst-init-element-path into master

Previously "elements" was hard-coded as the path for the elements directory whereas it was supposed to be configurable via the element_path option to init_project(). This led to incorrect behavior when bst init was run --element-path option.

Also, extend tests to test the creation of elements directory.

Fixes #398 (closed).

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