counsel.el: Add a generic minibuffer history browser. #1237
This supersedes counsel-shell-command-history and counsel-expression-history with a generic counsel-minibuffer-history function that works for all minibuffer situations.
This is probably a good idea performance-wise since it limits the number of collection updates when the user is typing. However, the main reason for this change is to work around an Emacs freeze on Windows when the dynamic collection is generated by an external command (see for example this bug in helm-ag which also affects counsel-ag and similar commands: emacsorphanage/helm-ag#188). Related to #1218 (but only applies for dynamic collections, where the difference is really noticeable). Helps with #1198 and #786.
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