Implement live search on /users

[mcdonnelldean]

• New component
• Should have clear button
• Dropdown to select column to search
• Columns provided via props
• Emits onSearch(term, target)

[mcdonnelldean]

Need to wait for design to be hammered out via #75

[mirceaalexandru]

@mcdonnelldean @ckiss Server service will provide feature for skip/limit and query for a regexp on a user property as part of pagination feature. Is that enough?