SCHEMA-344. Fix pager unit-tests when run against real HBase

- Tests do not rely on page sizes anymore.
- KijiClientTest no longer sets deprecated configuration fs.default.name

issue: https://jira.kiji.org/browse/SCHEMA-344
review: https://review.kiji.org/r/347
SCHEMA-348. TestHBaseKijiTableReader doesn't use KijiClientTest

- also fixes a few other tests.

issue: https://jira.kiji.org/browse/SCHEMA-348
review: https://review.kiji.org/r/358
SCHEMA-349. Tools to read from/write to HFiles

- Adds HFileTool to read/write from/to HFiles to/from HBase/Kiji tables.
- Fixes typos in kiji cat tool.

issue: https://jira.kiji.org/browse/SCHEMA-349
review: https://review.kiji.org/r/363