- #11 caused a bug where is was not possible to scroll anymore if
  topspace is disabled in the current buffer. This resolves that issue.

- #11 caused a bug with mouse scrolling - when scrolling down
  it would move buffer suddenly all the way to the bottom
  in some cases. This resolves that issue.

- Prevent a "Beginning of buffer" error message from appearing in the
  *Messages* buffer when scrolling above the top line.
- No longer modify `mwheel-scroll-down-function`, because before it was
  modified in order to prevent a scrolling bug, but that bug is avoided
  now by preventing the "Beginning of buffer" error from occurring.

- The buffer would get scrolled up too far by one line when scrolling
  text up in the following condition: top space was present before
  scrolling but not present after, and the top line in the buffer should
  be at the very top of the window after (but the bug made the second line
  be at the top of the window). This is resolved here.
- The technical reason for the bug was that 0.0 would be passed to `scroll-up`
  after `topspace--filter-args-scroll-up`, assuming that `scroll-up` would not
  scroll in this scenario, however it turns out that if
  `scroll-up`/`scroll-down` are passed a zero-valued float they will
  still scroll by one line.

Previous commit resolved #12's issue more succinctly,
making #12's solution to its issue unnecessary.

- Add *.elc to gitignore
- In tests/director.el, rename :run property key to :eval

- Update GIF to programmatically generated one

…18)

- Change default value for `topspace-autocenter-buffers` to
  `topspace-default-autocenter-buffers` function
- Add condition to `topspace-default-autocenter-buffers` so that it
  returns nil if user has scrolled buffer in the selected window before.
- Move default function values for some defcust's to User functions section

Remove Emacs 25.1 test untill coveralls reporting error is debugged

- Reduce number of cases that `topspace--count-lines` must be used
  in `topspace--filter-args-scroll-down`
- replace instances of `topsapce--height` with `topspace-height`

- Remove uneeded `topspace--count-lines` call in
  `topspace--filter-args-scroll-down`
- Make `topspace--count-lines` more accurate by not adding extra 1 to value
- Increase test coverage
- Make tests run in workflow only when a src file is changed
- Add supported Emacs versions badge to readme

- Rename `topspace-height-to-make-buffer-centered` back to
  `topspace--height-to-make-buffer-centered` from when it was accidentally
  renamed in commit 15ac6c9

- Add  `topspace-set-height` to allow users and external packages to update the top space height.
- Increase flexibility of `topspace-center-position` by allowing it to also be an integer or function as follows:

    If a float, it represents the position to center buffers as a ratio of
    frame height, and can be a value from 0.0 to 1.0 where lower values center
    buffers higher up in the screen.

    If a positive or negative integer value, buffers will be centered by putting
    their center line at a distance of `topspace-center-position' lines away
    from the top of the selected window when positive, or from the bottom
    of the selected window when negative.
    The distance will be in units of lines with height `default-line-height',
    and the value should be less than the height of the window.

    If a function, the same rules above apply to the functions' return value.

- Add `topspace-default-active` and set `topspace-active` default value to it, which makes topspace 
  not active in child frames by default
- Add `topspace-buffer-was-scrolled-p` which is used in `topspace-default-autocenter-buffers`
- Internal refactoring and updating of docstrings

- `topspace--count-pixel-height` was causing large performance overhead when opening large buffers, this is now resolved
- `topspace--count-pixel-height` performance was increased by about 50% overall