Add RapidJson headers

Change-Id: I641eff73a6166d8422fda46d07c41edcd436a047
(cherry picked from commit 8283544ab73da5c5a66313a6c90b7cdbed12bc67)
Changes in Impala-lzo for the compressed text reader

The compressed text reader patch, changes a bit the variables of the HdfsScanner and
HdfsTextScanner. Also, it removes the LZO_TEXT file format (it was not a file format,
rather a convention to identify lzo-compressed text files), and moves the INDEX_SUFFIX to
HdfsTextScanner. Finally, it changes the name of the IssueInitialRanges wrapper.
These changes are needed for Impala-lzo to compile.

Change-Id: Ibd6f5e0b16465806ef4be24e1451a2817f5f72d4
(cherry picked from commit 18f79623dd41ed36a8d7922431f3aba142e146ff)
Changes needed for IMP-1116.

The IMP-1116 patch changes some of the codec interfaces to int64_t (from int).
This change in Impala-lzo is needed for the code to compile.

Change-Id: I44f3c1202a4f01541688a92b2c00533f68d5a9c8
(cherry picked from commit 10482edf268b9e57a420523c610a3ce22b48ddc2)
Expr refactoring

Change-Id: I79c8573c93144f2532353a0a7c9555d7489489a5
Fix boost include to pick up path from environment if set.

Change-Id: I6a7c1499d8e21aeeb3900a88e1467036f3a764ce
Merge "Fix boost include to pick up path from environment if set."