Update requirement : add pymongo
Fix : Restrict test to test dir
Fix typos
Enh: Travis build
Add: requirements (again)
General worldmap plugin improvements

* Use _LAT and _LONG attritubes as alternative to _LOC_LAT and _LOC_LNG
  They are used, for example, by Nagvis GeoMap maps:
  https://clarin.fz-juelich.de/nagvis/docs/en_US/geomap.html
  It's a good way to keep compatibility with no user interaction

* Get and check valid coords refactoring
  Two new functions for this purpose in page and widget routing
  instead of using the same code

* New configuration variable: only_geo_hosts
  Let the user make the decision to draw only hosts with geo attributes
  Worldmap will not work in a huge infrastructure with more than 10.000 hosts
  placed in the same default point (beleive me, it doesn't work)
add map_layer conf again deleted in last commit
Merge remote-tracking branch 'upstream/master' into worldmap-improvements-dev
improve boolean param parse (only_geo_hosts)
Revert "Merge remote-tracking branch 'upstream/master' into worldmap-improvements-dev"

This reverts commit 7448af25dff607c2e00972c4e0d42f708eb6f80f, reversing
changes made to e2782be2c200f2aab70d28f448b244c7e9d66f43.
Merge pull request #87 from A3Sec/worldmap-improvements-dev

General worldmap plugin improvements