Scheme fixes corresponding with spec

See https://github.com/ietf-wg-cellar/matroska-specification/blob/master/ebml_matroska.xml

- Slices maxver is 0

See https://github.com/ietf-wg-cellar/ebml-specification/blob/master/ebml.xml

- CRC-32 description missing ending period.
- EBMLMaxIDLength range missing ">="
- EBMLMaxSizeLength should be "not 0"
- Deprecated Signature-related elements are at level 2 (SignatureSlot at level 1) (see ietf-wg-cellar/ebml-specification#391 (comment))
- EBML element is maxOccurs 1 so can't be multiple

lib/schema.js

@@ -57,7 +57,7 @@ var byEbmlID = {
 		name: "Slices",
 		level: 3,
 		type: "m",
-		maxver: 1,
+		maxver: 0,
 		description: "Contains slices description."
 	},
 	0x8f: {
@@ -337,7 +337,7 @@ var byEbmlID = {
 		type: "b",
 		minver: 1,
 		webm: false,
-		description: "The CRC is computed on all the data of the Master element it's in. The CRC element should be the first in it's parent master for easier reading. All level 1 elements should include a CRC-32. The CRC in use is the IEEE CRC32 Little Endian",
+		description: "The CRC is computed on all the data of the Master element it's in. The CRC element should be the first in it's parent master for easier reading. All level 1 elements should include a CRC-32. The CRC in use is the IEEE CRC32 Little Endian.",
 		crc: true
 	},
 	0xc0: {
@@ -744,15 +744,15 @@ var byEbmlID = {
 		type: "u",
 		mandatory: true,
 		"default": "4",
-		range: "4"
+		range: ">=4"
 	},
 	0x42f3: {
 		name: "EBMLMaxSizeLength",
 		level: 1,
 		type: "u",
 		mandatory: true,
 		"default": "8",
-		range: "1-8"
+		range: "not 0"
 	},
 	0x42f7: {
 		name: "EBMLReadVersion",
@@ -1707,7 +1707,7 @@ var byEbmlID = {
 	},
 	0x6532: {
 		name: "SignedElement",
-		level: 3,
+		level: 2,
 		type: "b",
 		multiple: true,
 		webm: false,
@@ -2044,28 +2044,28 @@ var byEbmlID = {
 	},
 	0x7e8a: {
 		name: "SignatureAlgo",
-		level: 1,
+		level: 2,
 		type: "u",
 		webm: false,
 		description: "Signature algorithm used (1=RSA, 2=elliptic)."
 	},
 	0x7e9a: {
 		name: "SignatureHash",
-		level: 1,
+		level: 2,
 		type: "u",
 		webm: false,
 		description: "Hash algorithm used (1=SHA1-160, 2=MD5)."
 	},
 	0x7ea5: {
 		name: "SignaturePublicKey",
-		level: 1,
+		level: 2,
 		type: "b",
 		webm: false,
 		description: "The public key to use with the algorithm (in the case of a PKI-based signature)."
 	},
 	0x7eb5: {
 		name: "Signature",
-		level: 1,
+		level: 2,
 		type: "b",
 		webm: false,
 		description: "The signature of the data (until a new."
@@ -2269,13 +2269,13 @@ var byEbmlID = {
 		level: "0",
 		type: "m",
 		mandatory: true,
-		multiple: true,
+		multiple: false,
 		minver: 1,
 		description: "Set the EBML characteristics of the data to follow. Each EBML document has to start with this."
 	},
 	0x1b538667: {
 		name: "SignatureSlot",
-		level: -1,
+		level: 1,
 		type: "m",
 		multiple: true,
 		webm: false,