[Fix #593] Restore compatibility with Emacs 24.3

Turns out the `thing-at-point' NO-PROPERTIES argument was introduced in Emacs 24.4.
[Fix #593] Fix error with no symbol at point
Merge pull request #595 from johnwalker/fix-593

[Fix #593] Fix error with no symbol at point
Add a couple of unit tests for cider-symbol-at-point
Fix showing documentation with company-doc-buffer.

Update company-doc-buffer to use new doc fn.

Extract doc buffer creation logic from cider-doc-lookup.
Merge pull request #596 from cichli/fix-company-doc

Fix showing documentation with company-doc-buffer.
Fix indentation
[Fix #552] Load resources from jar/zip files efficiently.

Instead of loading the entire `.jar` file into a buffer, just
extract the single resource to be displayed. Mark it read-only.
If that resource is already open, reuse it.
[Fix #589] Don't prefer local paths over tramp by default.

Rename `cider-use-local-resources` to `cider-prefer-local-resources` and
set default value to nil.

Remove `cider-home-prefix-adjustment`. It was unnecessary, and a bug in
`cider-emacs-or-clojure-side-adjustment` prevented it working
as (apparently) designed anyway.

Rename `cider-emacs-or-clojure-side-adjustment` to `cider-file-path` for
clarity (and brevity!).
Merge pull request #599 from jeffvalk/master

[Fix #552] Load resources from jar/zip files efficiently.
Update README and CHANGELOG.

Also, update an outdated docstring.
Merge pull request #600 from jeffvalk/master

Add `cider-prefer-local-resources` to README.
Use defvar-local
[Fix #554] Set cider-auto-select-error-buffer to t by default
Fix an incorrect comment
Fix a docstring
Prevent whitespace-mode from interfering with clojure font-locking in the REPL buffer
Fix `cider-company-location`.

Extract buffer creation logic from `cider-jump-to-def-for` and friends, so
said buffers can be passed to company-mode without being popped up.
Merge pull request #604 from cichli/fix-cider-company-location

Fix `cider-company-location`.
Issue a warning when all the required nREPL ops are not supported