Fixes bug#653.* lispy-test.el(lispy-simulate-key) (lispy-simulate-keys) (lispy-simulate-expect):Added facilities to assert results after a given set of keypresses.(lispy-read-unsafe-chars): added regression tests for bug#648.

Fixes bug#647.Lispy would assume an implicit nil after the reader syntax, like this:```emacs-lisp(defun foo ()  '  (bar baz)  ) ;; point here, press i to format```Gets this incorrect result:```emacs-lisp(defun foo ()  '() (bar baz))```* lispy.el (lispy--delete-insignificant-sexps): allow removing sexps that areimplicitly-created by lispy, and serve no purpose in the real input and outputsexp other than formatting.  At the moment, just remove newline nodes.(lispy--read-reader-syntax): helper function to avoid code duplication; replacesa reader syntax RS, e.g., "`", plus its immediately-next sexp into an internalrepresentation with TAG.(lispy--read): update handling of "#'", ",@", "'", "`", "," to make use of`lispy--read-reader-syntax'.(lispy--insert): fixed float and quasiquote handling (currently it calls`(insert (caddr sxp))', which is incorrect because `insert' considers it acharacter; float was not problematic because this code path was never triggered:things like 1.2 have not been converted into `ly-raw float' constructs anyway.* lispy-test.el (lispy-read-quote-newline): added 5 simple tests for each of theaddressed reader syntaxes.