first cut at getBars()
new helper function bbgDatetimeToUTC to return timestamps in UTC
new accessor functions getBars and getTicks

- based on example in Bloomberg docs
- added appropriate documentation snippets via roxygen
- also increased Version: in Description
Merge remote-tracking branch 'parentrepo/master'
Merge remote-tracking branch 'parentrepo/master' into feature/get-ticks-and-bars
Merge remote-tracking branch 'origin/master' into feature/get-ticks-and-bars
adjust timestamp of bars to report the _end_ of the bar, not the beginning

in other words, adjust to the common "time t" subset of the last
observation (ie end of bar) and not the beginning of the bar
add note that time value is adjusted to _end_ of bar
correct error in manual page
support different return types: fts, xts, zoo, or default matrix
also offer choice of return type for getBars(); bump Version
Merge pull request #4 from eddelbuettel/feature/get-ticks-and-bars

Feature/get ticks and bars