lobstr 1.1.2

• Switched to cpp11 from Rcpp.

• Relicensed as MIT (#51).

• obj_size() and sxp() now support non-nil terminated pairlists.

• obj_size() now displays large objects with KB, MB, etc (#57, #60),
  and no longer returns NA for objects larger than 2^31 bytes (#45).

• obj_sizes() now computes relative sizes correctly (without meaningless
  floating point differences).

• ref() lists all contents of environments even those with names beginning
  with . (@krlmlr, #53).

• New, experimental tree() function as alternative to str() (#56).