v2.0.0

• Added methods:getTitleText(), getTitleTextColor(), getSubtitle(), getSubtitleTextColor(), getRetryButtonText(), isTitleVisible(), isSubtitleVisible(), isRetryButtonVisible().
• Renamed methods:
  setErrorImageResource(int) -> setImageResource(),
  setErrorImageDrawable(Drawable) -> setImageDrawable(Drawable),
  setErrorImageBitmap(Bitmap) -> setImageBitmap(Bitmap),
  setErrorTitle(String) -> setTitle(String),
  setErrorTitle(int) -> setTitle(int),
  setErrorTitleColor(int) -> setTitleColor(int),
  setErrorSubtitle(String) -> setSubtitle(String),
  setErrorSubtitle(int) -> setSubtitle(int),
  setErrorSubtitleColor(int) -> setSubtitleColor(int)
• Renamed attributes:
  ev_errorTitle -> ev_title,
  ev_errorTitleColor -> ev_titleColor,
  ev_errorSubtitle -> ev_subtitle,
  ev_errorSubtitleColor -> ev_subtitleColor
• Made it possible to set the retry button text in xml. You can now use ev_retryButtonText="string".
• Moved RetryListener inside ErrorView. (It's now under tr.xip.errorview.ErrorView, and not tr.xip.errorview).
• Renamed ErrorViewStatusCodes to HttpStatusCodes.