minor change in RoutingTable::NthElementSortFromTarget
Fixes segfault caused by accessing destroyed logging object when test file is successfully removed.
Wrap test file removal with non-fatal test assertion.
removing unnecessary mutex in routing network test + minor change in RoutingTable::NthElementSortFromTarget
adding directives to choose partial_sort instead of nth_element when gcc version =< 4.8.2 is used
fixing compiler directives
Merge pull request #19 from BSMaidSafe/MAID-259_RoutingNetworkTest_Segfault

Fixes segfault caused by accessing destroyed logging object when test fi...
Merge remote-tracking branch 'upstream/next' into MAID-193_RoutingTableTest.BEH_GetNthClosest
Merge pull request #17 from mmoadeli/MAID-193_RoutingTableTest.BEH_GetNthClosest

minor change in RoutingTable::NthElementSortFromTarget